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* Retire zio_bulk_flagsBrian Behlendorf2015-02-101-11/+0
| | | | | | | | | | | | Long ago the zio_bulk_flags module parameter was introduced to facilitate debugging and profiling the zio_buf_caches. Today this code works well and there's no compelling reason to keep this functionality. In fact it's preferable to revert this so the code is more consistent with other ZFS implementations. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Ned Bass <[email protected]> Issue #3063
* Document zfs_flags module parameterNed Bass2015-01-071-2/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a table describing the debugging flags that can be set in the zfs_flags module parameter. Also change the module_param type to 'uint' so users aren't shown a negative value. The updated man page text is reproduced below for convenience. zfs_flags (int) Set additional debugging flags. The following flags may be bitwise-or'd together. +-------------------------------------------------------+ |Value Symbolic Name | | Description | +-------------------------------------------------------+ | 1 ZFS_DEBUG_DPRINTF | | Enable dprintf entries in the debug log. | +-------------------------------------------------------+ | 2 ZFS_DEBUG_DBUF_VERIFY * | | Enable extra dbuf verifications. | +-------------------------------------------------------+ | 4 ZFS_DEBUG_DNODE_VERIFY * | | Enable extra dnode verifications. | +-------------------------------------------------------+ | 8 ZFS_DEBUG_SNAPNAMES | | Enable snapshot name verification. | +-------------------------------------------------------+ | 16 ZFS_DEBUG_MODIFY | | Check for illegally modified ARC buffers. | +-------------------------------------------------------+ | 32 ZFS_DEBUG_SPA | | Enable spa_dbgmsg entries in the debug log. | +-------------------------------------------------------+ | 64 ZFS_DEBUG_ZIO_FREE | | Enable verification of block frees. | +-------------------------------------------------------+ | 128 ZFS_DEBUG_HISTOGRAM_VERIFY | | Enable extra spacemap histogram verifications. | +-------------------------------------------------------+ * Requires debug build. Default value: 0. Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2988
* Fix small spelling mistakeRandall Mason2014-11-141-1/+1
| | | | | | | | recieve becomes receive Signed-off-by: Randall Mason <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2877
* Illumos 4924 - LZ4 Compression for metadataDaniil Lunev2014-10-201-5/+8
| | | | | | | | | | | | | | | | | | | | | Reviewed by Matthew Ahrens <[email protected]> Reviewed by Saso Kiselkov <[email protected]> Approved by: Christopher Siden <[email protected]> References: https://github.com/illumos/illumos-gate/commit/b8289d2 https://www.illumos.org/issues/3756 Porting notes: The static function zfs_prop_activate_feature() was removed because this change removes the only caller. The function was not removed from Illumos but instead left as dead code. However, to keep gcc happy it was removed from Linux and may be easily restored if needed. Ported by: DHE <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #1540
* Add a stern warning about dedupTurbo Fredriksson2014-10-081-0/+12
| | | | | | | | | | | Users intending to use dedup should be clearly advised about its memory requirements and the risks involved. Thanx to Sachiru for comments and suggestions. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2754
* Add an example for 'zfs bookmark' to the Example section.Turbo Fredriksson2014-10-071-0/+15
| | | | | | Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2762
* Implement -t option to zpool create for temporary pool namesRichard Yao2014-09-301-2/+13
| | | | | | | | | | | | | | | | | | | | | | | | | Creating virtual machines that have their rootfs on ZFS on hosts that have their rootfs on ZFS causes SPA namespace collisions when the standard name rpool is used. The solution is either to give each guest pool a name unique to the host, which is not always desireable, or boot a VM environment containing an ISO image to install it, which is cumbersome. 26b42f3f9d03f85cc7966dc2fe4dfe9216601b0e introduced `zpool import -t ...` to simplify situations where a host must access a guest's pool when there is a SPA namespace conflict. We build upon that to introduce `zpool import -t tname ...`. That allows us to create a pool whose in-core name is tname, but whose on-disk name is the normal name specified. This simplifies the creation of machine images that use a rootfs on ZFS. That benefits not only real world deployments, but also ZFSOnLinux development by decreasing the time needed to perform rootfs on ZFS experiments. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2417
* zpool import -t should not update cachefileRichard Yao2014-09-301-1/+1
| | | | | | | | | | | | | zpool import's -t parameter is intended for use with -R when operating on pools that belong to other systems. Like -R, pools imported in this way should not update the cachefile unless explicitly requested. The initial implementation allowed the cachefile to be updated when -R was not used. This went uncaught during testing because -R had implicitly disabled use of the cachefile. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2417
* Make user stack limit configurableBrian Behlendorf2014-09-301-0/+16
| | | | | | | | | | | | | | | | | To aid in detecting and debugging stack overflow issues make the user space stack limit configurable via a new ZFS_STACK_SIZE environment variable. The value assigned to ZFS_STACK_SIZE will be used as the default stack size in bytes. Because this is mainly useful as a debugging aid in conjunction with ztest the stack limit is disabled by default. See the ztest(1) man page for additional details on using the ZFS_STACK_SIZE environment variable. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Ned Bass <[email protected]> Closes #2743 Issue #2293
* Refer to ZED's scripts as ZEDLETsChris Dunlap2014-09-251-41/+42
| | | | | | | | | | | | | | The executables invoked by the ZED in response to a given zevent have been generically referred to as "scripts". By convention, these scripts have aimed to be /bin/sh compatible for reasons of portability and comprehensibility. However, the ZED only requires they be executable and (ideally) capable of reading environment variables. As such, these scripts are now referred to as ZEDLETs (ZFS Event Daemon Linkage for Executable Tasks). Signed-off-by: Chris Dunlap <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2735
* Illumos 5138 - add tunable for maximum number of blocks freed in one txgMax Grossman2014-09-231-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Mattew Ahrens <[email protected]> Reviewed by: Josef 'Jeff' Sipek <[email protected]> Reviewed by: Richard Elling <[email protected]> Reviewed by: George Wilson <[email protected]> Approved by: Dan McDonald <[email protected]> References: https://www.illumos.org/issues/5138 https://github.com/illumos/illumos-gate/commit/af3465d Porting notes: Because support for exposing a uint64_t parameter wasn't added until v3.17-rc1 the zfs_free_max_blocks variable has been declared as a unsigned long. This is already far larger than required and it allows us to avoid additional autoconf compatibility code. The default value has been set to 100,000 on Linux instead of ULONG_MAX which is used on Illumos. This was done to limit the number of outstanding IOs in the system when snapshots are destroyed. This helps ensure individual TXG sync times are kept reasonable and memory isn't wasted managing a huge backlog of outstanding IOs. Ported by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2675 Closes #2581
* Illumos 5161 - add tunable for number of metaslabs per vdevMatthew Ahrens2014-09-231-0/+11
| | | | | | | | | | | | | | | | | | | 5161 add tunable for number of metaslabs per vdev Reviewed by: Alex Reece <[email protected]> Reviewed by: Christopher Siden <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Paul Dagnelie <[email protected]> Reviewed by: Saso Kiselkov <[email protected]> Reviewed by: Richard Elling <[email protected]> Approved by: Richard Lowe <[email protected]> References: https://www.illumos.org/issues/5161 https://github.com/illumos/illumos-gate/commit/bf3e216 Ported by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2698
* Document environment variables for zdb, zfs, zinject and zpool.Turbo Fredriksson2014-09-184-0/+24
| | | | | | Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2691
* Document the "readonly" pool propertyTim Chase2014-09-091-0/+18
| | | | | | | | This documentation is based FreeBSD's zpool(8) man page. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2682
* Change the default 'zfs_dedup_prefetch' value to '0'Alexey Smirnoff2014-09-041-1/+1
| | | | | | | | | This gives a huge performance improvement in operations with deduped datasets especially when the bottleneck is the amount of ram available for zfs. Signed-off-by: Brian Behlendorf <[email protected]> Closes #2639
* Illumos 4970-4974 - extreme rewind enhancementsMatthew Ahrens2014-08-261-0/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 4970 need controls on i/o issued by zpool import -XF 4971 zpool import -T should accept hex values 4972 zpool import -T implies extreme rewind, and thus a scrub 4973 spa_load_retry retries the same txg 4974 spa_load_verify() reads all data twice Reviewed by: Christopher Siden <[email protected]> Reviewed by: Dan McDonald <[email protected]> Reviewed by: George Wilson <[email protected]> Approved by: Robert Mustacchi <[email protected]> References: https://www.illumos.org/issues/4970 https://www.illumos.org/issues/4971 https://www.illumos.org/issues/4972 https://www.illumos.org/issues/4973 https://www.illumos.org/issues/4974 https://github.com/illumos/illumos-gate/commit/e42d205 Notes: This set of patches adds a set of tunable parameters for the "extreme rewind" mode of pool import which allows control over the traversal performed during such an import. Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2598
* Illumos 5034 - ARC's buf_hash_table is too smallMatthew Ahrens2014-08-261-0/+16
| | | | | | | | | | | | | | | | | 5034 ARC's buf_hash_table is too small Reviewed by: Christopher Siden <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Saso Kiselkov <[email protected]> Reviewed by: Richard Elling <[email protected]> Approved by: Gordon Ross <[email protected]> References: https://www.illumos.org/issues/5034 https://github.com/illumos/illumos-gate/commit/63e911b Ported-by: Brian Behlendorf <[email protected]> Closes #2615
* Illumos 4976-4984 - metaslab improvementsGeorge Wilson2014-08-183-19/+121
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 4976 zfs should only avoid writing to a failing non-redundant top-level vdev 4978 ztest fails in get_metaslab_refcount() 4979 extend free space histogram to device and pool 4980 metaslabs should have a fragmentation metric 4981 remove fragmented ops vector from block allocator 4982 space_map object should proactively upgrade when feature is enabled 4983 need to collect metaslab information via mdb 4984 device selection should use fragmentation metric Reviewed by: Matthew Ahrens <[email protected]> Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Christopher Siden <[email protected]> Approved by: Garrett D'Amore <[email protected]> References: https://www.illumos.org/issues/4976 https://www.illumos.org/issues/4978 https://www.illumos.org/issues/4979 https://www.illumos.org/issues/4980 https://www.illumos.org/issues/4981 https://www.illumos.org/issues/4982 https://www.illumos.org/issues/4983 https://www.illumos.org/issues/4984 https://github.com/illumos/illumos-gate/commit/2e4c998 Notes: The "zdb -M" option has been re-tasked to display the new metaslab fragmentation metric and the new "zdb -I" option is used to control the maximum number of in-flight I/Os. The new fragmentation metric is derived from the space map histogram which has been rolled up to the vdev and pool level and is presented to the user via "zpool list". Add a number of module parameters related to the new metaslab weighting logic. Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2595
* Create an 'overlay' propertyTurbo Fredriksson2014-08-151-0/+11
| | | | | | | | | | | | | | | Add a new 'overlay' property (default 'off') that controls whether the filesystem should be mounted even if the mountpoint is busy or if it should fail with a 'mountpoint not empty'. Doing overlay mounts is the default mount behavior on Linux, but not in ZFS. It have been decided that following the ZFS behavior should be the default, but this overlay allows for site administrator to override this decision on a per-dataset basis. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes: #2503
* Illumos 4390 - I/O errors can corrupt space map when deleting fs/volMatthew Ahrens2014-08-041-0/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 4390 i/o errors when deleting filesystem/zvol can lead to space map corruption Reviewed by: George Wilson <[email protected]> Reviewed by: Christopher Siden <[email protected]> Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Dan McDonald <[email protected]> Reviewed by: Saso Kiselkov <[email protected]> Approved by: Dan McDonald <[email protected]> References: https://www.illumos.org/issues/4390 https://github.com/illumos/illumos-gate/commit/7fd05ac Porting notes: Previous stack-reduction efforts in traverse_visitb() caused a fair number of un-mergable pieces of code. This patch should reduce its stack footprint a bit more. The new local bptree_entry_phys_t in bptree_add() is dynamically-allocated using kmem_zalloc() for the purpose of stack reduction. The new global zfs_free_leak_on_eio has been defined as an integer rather than a boolean_t as was the case with the related zfs_recover global. Also, zfs_free_leak_on_eio's definition has been inserted into zfs_debug.c for consistency with the existing definition of zfs_recover. Illumos placed it in spa_misc.c. Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2545
* Illumos 4757, 4913Matthew Ahrens2014-08-012-4/+64
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 4757 ZFS embedded-data block pointers ("zero block compression") 4913 zfs release should not be subject to space checks Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Max Grossman <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Christopher Siden <[email protected]> Reviewed by: Dan McDonald <[email protected]> Approved by: Dan McDonald <[email protected]> References: https://www.illumos.org/issues/4757 https://www.illumos.org/issues/4913 https://github.com/illumos/illumos-gate/commit/5d7b4d4 Porting notes: For compatibility with the fastpath code the zio_done() function needed to be updated. Because embedded-data block pointers do not require DVAs to be allocated the associated vdevs will not be marked and therefore should not be unmarked. Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2544
* Illumos 3835 zfs need not store 2 copies of all metadataMatthew Ahrens2014-07-311-1/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Reviewed by: George Wilson <[email protected]> Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Dan McDonald <[email protected]> Approved by: Richard Lowe <[email protected]> Description from Matt Ahrens's bug report at Delphix: Add a new zfs property, "redundant_metadata" which can have values "all" or "most". The default will be "all", which is the current behavior. Setting to "most" will cause us to only store 1 copy of level-1 indirect blocks of user data files. Additional notes: The new man page section for this property states "The exact behavior of which metadata blocks are stored redundantly may change in future releases." and: "When set to most, ZFS stores an extra copy of most types of metadata. This can improve performance of random writes, because less metadata must be written." The current implementation is as described above in Matt's blog. It is controlled by a new global integer "zfs_redundant_metadata_most_ditto_level", currently initialized to 2. When "redundant_metadata" is set to "most", only indirect blocks of the specified level and higher will have additional ditto blocks created. Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2542
* Illumos 4368, 4369.Matthew Ahrens2014-07-292-14/+113
| | | | | | | | | | | | | | | | | 4369 implement zfs bookmarks 4368 zfs send filesystems from readonly pools Reviewed by: Christopher Siden <[email protected]> Reviewed by: George Wilson <[email protected]> Approved by: Garrett D'Amore <[email protected]> References: https://www.illumos.org/issues/4369 https://www.illumos.org/issues/4368 https://github.com/illumos/illumos-gate/commit/78f1710 Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2530
* Illumos 4370, 4371Max Grossman2014-07-281-0/+65
| | | | | | | | | | | | | | | | | | | | 4370 avoid transmitting holes during zfs send 4371 DMU code clean up Reviewed by: Matthew Ahrens <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Christopher Siden <[email protected]> Reviewed by: Josef 'Jeff' Sipek <[email protected]> Approved by: Garrett D'Amore <[email protected]>a References: https://www.illumos.org/issues/4370 https://www.illumos.org/issues/4371 https://github.com/illumos/illumos-gate/commit/43466aa Ported by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2529
* Illumos 4171, 4172Matthew Ahrens2014-07-251-0/+22
| | | | | | | | | | | | | | | | | | | | 4171 clean up spa_feature_*() interfaces 4172 implement extensible_dataset feature for use by other zpool features Reviewed by: Max Grossman <[email protected]> Reviewed by: Christopher Siden <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Jerry Jelinek <[email protected]> Approved by: Garrett D'Amore <[email protected]>a References: https://www.illumos.org/issues/4171 https://www.illumos.org/issues/4172 https://github.com/illumos/illumos-gate/commit/2acef22 Ported-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2528
* Support '-H' (scripted mode) to 'zpool get'Turbo Fredriksson2014-07-251-1/+12
| | | | | | | | | This functionality is already available in 'zfs get'. Providing it for 'zpool get' is useful and good for consistency. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes: #2522
* Initial attempt to document events and payloads.Turbo Fredriksson2014-07-252-1/+750
| | | | | | | | | | | | In no way complete - most have been trial and error and some deducing what they could mean. It needs more information from someone that knows the code better. But this is a start and it lays the basic structure for adding this additional detail. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2357
* Illumos #4101, #4102, #4103, #4105, #4106George Wilson2014-07-221-2/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 4101 metaslab_debug should allow for fine-grained control 4102 space_maps should store more information about themselves 4103 space map object blocksize should be increased 4105 removing a mirrored log device results in a leaked object 4106 asynchronously load metaslab Reviewed by: Matthew Ahrens <[email protected]> Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Sebastien Roy <[email protected]> Approved by: Garrett D'Amore <[email protected]> Prior to this patch, space_maps were preferred solely based on the amount of free space left in each. Unfortunately, this heuristic didn't contain any information about the make-up of that free space, which meant we could keep preferring and loading a highly fragmented space map that wouldn't actually have enough contiguous space to satisfy the allocation; then unloading that space_map and repeating the process. This change modifies the space_map's to store additional information about the contiguous space in the space_map, so that we can use this information to make a better decision about which space_map to load. This requires reallocating all space_map objects to increase their bonus buffer size sizes enough to fit the new metadata. The above feature can be enabled via a new feature flag introduced by this change: com.delphix:spacemap_histogram In addition to the above, this patch allows the space_map block size to be increase. Currently the block size is set to be 4K in size, which has certain implications including the following: * 4K sector devices will not see any compression benefit * large space_maps require more metadata on-disk * large space_maps require more time to load (typically random reads) Now the space_map block size can adjust as needed up to the maximum size set via the space_map_max_blksz variable. A bug was fixed which resulted in potentially leaking an object when removing a mirrored log device. The previous logic for vdev_remove() did not deal with removing top-level vdevs that are interior vdevs (i.e. mirror) correctly. The problem would occur when removing a mirrored log device, and result in the DTL space map object being leaked; because top-level vdevs don't have DTL space map objects associated with them. References: https://www.illumos.org/issues/4101 https://www.illumos.org/issues/4102 https://www.illumos.org/issues/4103 https://www.illumos.org/issues/4105 https://www.illumos.org/issues/4106 https://github.com/illumos/illumos-gate/commit/0713e23 Porting notes: A handful of kmem_alloc() calls were converted to kmem_zalloc(). Also, the KM_PUSHPAGE and TQ_PUSHPAGE flags were used as necessary. Ported-by: Tim Chase <[email protected]> Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2488
* zdb: Introduce -V for verbatim importRichard Yao2014-07-171-1/+12
| | | | | | | | | | | | | When given a pool name via -e, zdb would attempt an import. If it failed, then it would attempt a verbatim import. This behavior is not always desirable so a -V switch is added to zdb to control the behavior. When specified, a verbatim import is done. Otherwise, the behavior is as it was previously, except no verbatim import is done on failure. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2372
* Convert zfs_mg_noalloc_threshold to a module parameter and documentTim Chase2014-07-161-0/+26
| | | | | | | | | | The parameter was added as illumos issue 4081 which was committed to zfsonlinux in ac72fac3eaa569902cad88053167f7d74e7fe7e4. This patch documents the parameter and allows for it to be set as a module parameter. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2483
* Document the optional "device" argument for "zpool split"Tim Chase2014-07-011-3/+5
| | | | | | | | | Most ZFS implementations seemed to have missed this bit of documentation. The additional text is based on FreeBSD's man page. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2416
* Add information about the -o option to zpool replaceTurbo Fredriksson2014-06-271-2/+13
| | | | | | | | | | Users need to be aware that when replacing devices in an existing pool they may need to override automatically detected ashift value. This will all depend on the exact hardware they are using. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2024
* Fix man zpool property feature_guidSenH2014-06-261-0/+1
| | | | | | | | | | | | | | | | | | The property name gets mangled with the explanation due to the property length. Fixed by putting the explanation on the next line. Before: unsupported@feature_Info rmation about unsupported features that are enabled on the pool. See zpool-features(5) for details. After: unsupported@feature_guid Information about unsupported features that are enabled on the pool. See zpool-features(5) for details. Signed-off-by: SenH <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2419
* Document the -X and -T options to 'zpool import'Turbo Fredriksson2014-06-061-2/+48
| | | | | | | | | | | These options have existed for a long time but have historically been undocumented because they are not guaranteed to be safe. They should only be used as a last resort when attempting to recover a damaged pool. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #1130
* Expand the description of scan-related and other parameters.Tim Chase2014-06-061-9/+16
| | | | | | | | | | | | | Document that the scan-related parameters are, in fact, applicable only to scrub and/or resilver operations as appropriate. Expand a few of the prefetch-related descriptions. Add clarification to other module parameters. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2361
* Man page updates for 'zfs share'Turbo Fredriksson2014-06-061-1/+9
| | | | | | | | | | * Remove the references to share(1M), unshare(1M) and dfstab(4) since they are not applicable to Linux. * Add the exact exportfs command line used when setting sharenfs=on. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue: #1641
* Document the fact that ashift is vdev specific, not a pool global.Turbo Fredriksson2014-06-061-1/+3
| | | | | | | | | | Users need to be aware that when adding devices to an existing pool they may need to override automatically detected ashift value. This will all depend on the exact hardware they are using. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes: #2024
* Illumos #4101 finer-grained control of metaslab_debugGeorge Wilson2014-05-061-2/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | Today the metaslab_debug logic performs two tasks: - load all metaslabs on import/open - don't unload metaslabs at the end of spa_sync This change provides knobs for each of these independently. References: https://illumos.org/issues/4101 https://github.com/illumos/illumos-gate/commit/0713e23 Notes: 1) This is a small piece of the metaslab improvement patch from Illumos. It was worth bringing over before the rest, since it's low risk and it can be useful on fragmented pools (e.g. Lustre MDTs). metaslab_debug_unload would give the performance benefit of the old metaslab_debug option without causing unwanted delay during pool import. Ported-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2227
* Initial implementation of zed (ZFS Event Daemon)Chris Dunlap2014-04-023-0/+289
| | | | | | | | | | | | | | | | | | | | | | | zed monitors ZFS events. When a zevent is posted, zed will run any scripts that have been enabled for the corresponding zevent class. Multiple scripts may be invoked for a given zevent. The zevent nvpairs are passed to the scripts as environment variables. Events are processed synchronously by the single thread, and there is no maximum timeout for script execution. Consequently, a misbehaving script can delay (or forever block) the processing of subsequent zevents. Plans are to address this in future commits. Initial scripts have been developed to log events to syslog and send email in response to checksum/data/io errors and resilver.finish/scrub.finish events. By default, email will only be sent if the ZED_EMAIL variable is configured in zed.rc (which is serving as a config file of sorts until a proper configuration file is implemented). Signed-off-by: Chris Dunlap <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2
* Implement -t option to zpool import for temporary pool namesRichard Yao2014-03-201-2/+13
| | | | | | | | | | | | | | | | Originally, users had to handle spa namespace collisions by either exporting the already imported pool or by specifying a new name for the pool with a conflicting name. In the case of root pools from virtual guests, neither approach to collision resolution is reasonable. This is addressed by extending the new name syntax with a -t option to specify that the new name is temporary. When specified, this sets an internal flag that is passed into the kernel to tell it that all label updates should refer to the name used in the original label. Consequently, the original pool name will be retained on export. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2189
* Fix NAME section of manpages zhack and fsck.zfs.Turbo Fredriksson2014-03-102-2/+3
| | | | | | | | | | | | | | | | In Debian GNU/Linux a program called 'linitian' is used to make sure that packages conforms to the Debian GNU/Linux packaging guide lines. This fixes the problem reported as: W: zfsutils: manpage-has-bad-whatis-entry usr/share/man/man1/zhack.1.gz W: zfsutils: manpage-has-bad-whatis-entry usr/share/man/man8/fsck.zfs.8.gz Not something that ZoL needs to addhere to, but every other man page have their NAME section in a special way - why not these two as well? Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2161
* Disable arc_p adapt dampener by defaultPrakash Surya2014-02-211-0/+11
| | | | | | | | | | | It's unclear why adjustments to arc_p need to be dampened as they are in arc_adjust. With that said, it's removal significantly improves the arc's ability to "warm up" to a given workload. Thus, I'm disabling by default until its usefulness is better understood. Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2110
* Allow "arc_p" to drop to zero or grow to "arc_c"Prakash Surya2014-02-211-11/+0
| | | | | | | | | | | | | | | | | | Setting a limit on the minimum value of "arc_p" has been shown to have detrimental effects on the arc hit rate for certain "metadata" intensive workloads. Specifically, this has been exhibited with a workload that constantly dirties new "metadata" but also frequently touches a "small" amount of mfu data (e.g. mkdir's). What is seen is that the new anon data throttles the mfu list to a negligible size (because arc_p > anon + mru in arc_get_data_buf), even though the mfu ghost list receives a constant stream of hits. To remedy this, arc_p is now allowed to drop to zero if the algorithm deems it necessary. Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2110
* Disable aggressive arc_p growth by defaultPrakash Surya2014-02-211-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For specific workloads consisting mainly of mfu data and new anon data buffers, the aggressive growth of arc_p found in the arc_get_data_buf() function can have detrimental effects on the mfu list size and ghost list hit rate. Running a workload consisting of two processes: * Process 1 is creating many small files * Process 2 is tar'ing a directory consisting of many small files I've seen arc_p and the mru grow to their maximum size, while the mru ghost list receives 100K times fewer hits than the mfu ghost list. Ideally, as the mfu ghost list receives hits, arc_p should be driven down and the size of the mfu should increase. Given the specific workload I was testing with, the mfu list size should grow to a point where almost no mfu ghost list hits would occur. Unfortunately, this does not happen because the newly dirtied anon buffers constancy drive arc_p to its maximum value and keep it there (effectively prioritizing the mru list and starving the mfu list down to a negligible size). The logic to increment arc_p from within the arc_get_data_buf() function was introduced many years ago in this upstream commit: commit 641fbdae3a027d12b3c3dcd18927ccafae6d58bc Author: maybee <none@none> Date: Wed Dec 20 15:46:12 2006 -0800 6505658 target MRU size (arc.p) needs to be adjusted more aggressively and since I don't fully understand the motivation for the change, I am reluctant to completely remove it. As a way to test out how it's removal might affect performance, I've disabled that code by default, but left it tunable via a module option. Thus, if its removal is found to be grossly detrimental for certain workloads, it can be re-enabled on the fly, without a code change. Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #2110
* Implement relatime.Tim Chase2014-01-291-1/+13
| | | | | | | | | | | | Add the "relatime" property. When set to "on", a file's atime will only be updated if the existing atime at least a day old or if the existing ctime or mtime has been updated since the last access. This behavior is compatible with the Linux "relatime" mount option. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2064 Closes #1917
* Remove incorrect use of EXTRA_DIST for man pagesBrian Behlendorf2014-01-173-7/+4
| | | | | | | | | | Setting the 'dist_' prefix is the correct way to instruct Automake to include these files in the distribution. The EXTRA_DIST variable is reserved for files which are not covered by the automatic rules. http://www.gnu.org/software/automake/manual/automake.html#Basics Signed-off-by: Brian Behlendorf <[email protected]>
* vdev_id: support per-channel slot mappingsNed Bass2014-01-171-55/+33
| | | | | | | | | | | | | | | | | The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2056
* Add full SELinux supportMatthew Thode2013-12-192-0/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Four new dataset properties have been added to support SELinux. They are 'context', 'fscontext', 'defcontext' and 'rootcontext' which map directly to the context options described in mount(8). When one of these properties is set to something other than 'none'. That string will be passed verbatim as a mount option for the given context when the filesystem is mounted. For example, if you wanted the rootcontext for a filesystem to be set to 'system_u:object_r:fs_t' you would set the property as follows: $ zfs set rootcontext="system_u:object_r:fs_t" storage-pool/media This will ensure the filesystem is automatically mounted with that rootcontext. It is equivalent to manually specifying the rootcontext with the -o option like this: $ zfs mount -o rootcontext=system_u:object_r:fs_t storage-pool/media By default all four contexts are set to 'none'. Further information on SELinux contexts is detailed in mount(8) and selinux(8) man pages. Signed-off-by: Matthew Thode <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Richard Yao <[email protected]> Closes #1504
* Add zfs_send_corrupt_data module optionTurbo Fredriksson2013-12-181-0/+11
| | | | | | | | | Tuning setting to ignore read/checksum errors when sending data. Signed-off-by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #1982 Issue #1897
* Update zfs(8) Snapshots sectionBrian Behlendorf2013-12-161-1/+1
| | | | | | | | | | | | | The Snapshots section of the zfs(8) man page is incorrect and should have been updated as part of #1312. Snapshots of volumes can be accessed independently and their visibility is determined by the 'snapdev=hidden|visible' property. This is analogous to the existing 'snapdir=hidden|visible' property. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Tim Chase <[email protected]> Closes #1921
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