diff options
| author | Matthew Ahrens <[email protected]> | 2014-05-23 08:21:07 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2014-07-31 09:49:34 -0700 |
| commit | faf0f58c69607a15e2d1563567afb815842805de (patch) | |
| tree | bd2cfbb4296353792f34d11c09cbd108b7757ed1 /include/sys/fs | |
| parent | 603cb25ca51ff89366886f9a4ed58f68b6aba2da (diff) | |
Illumos 3835 zfs need not store 2 copies of all metadata
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
Diffstat (limited to 'include/sys/fs')
| -rw-r--r-- | include/sys/fs/zfs.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/sys/fs/zfs.h b/include/sys/fs/zfs.h index 53f2718ab..5371e12ef 100644 --- a/include/sys/fs/zfs.h +++ b/include/sys/fs/zfs.h @@ -21,7 +21,7 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2013 by Delphix. All rights reserved. + * Copyright (c) 2011, 2014 by Delphix. All rights reserved. * Copyright 2011 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2012, Joyent, Inc. All rights reserved. */ @@ -149,6 +149,7 @@ typedef enum { ZFS_PROP_SELINUX_DEFCONTEXT, ZFS_PROP_SELINUX_ROOTCONTEXT, ZFS_PROP_RELATIME, + ZFS_PROP_REDUNDANT_METADATA, ZFS_NUM_PROPS } zfs_prop_t; @@ -349,6 +350,11 @@ typedef enum { ZFS_XATTR_SA = 2 } zfs_xattr_type_t; +typedef enum { + ZFS_REDUNDANT_METADATA_ALL, + ZFS_REDUNDANT_METADATA_MOST +} zfs_redundant_metadata_type_t; + /* * On-disk version number. */ |