diff options
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 26 | ||||
| -rw-r--r-- | module/zfs/metaslab.c | 4 |
2 files changed, 30 insertions, 0 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index 586712940..d3aa2e6b0 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -732,6 +732,32 @@ Use \fB1\fR for yes and \fB0\fR for no (default). .sp .ne 2 .na +\fBzfs_mg_noalloc_threshold\fR (int) +.ad +.RS 12n +Defines a threshold at which metaslab groups should be eligible for +allocations. The value is expressed as a percentage of free space +beyond which a metaslab group is always eligible for allocations. +If a metaslab group's free space is less than or equal to the +the threshold, the allocator will avoid allocating to that group +unless all groups in the pool have reached the threshold. Once all +groups have reached the threshold, all groups are allowed to accept +allocations. The default value of 0 disables the feature and causes +all metaslab groups to be eligible for allocations. + +This parameter allows to deal with pools having heavily imbalanced +vdevs such as would be the case when a new vdev has been added. +Setting the threshold to a non-zero percentage will stop allocations +from being made to vdevs that aren't filled to the specified percentage +and allow lesser filled vdevs to acquire more allocations than they +otherwise would under the old \fBzfs_mg_alloc_failures\fR facility. +.sp +Default value: \fB0\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_no_scrub_io\fR (int) .ad .RS 12n diff --git a/module/zfs/metaslab.c b/module/zfs/metaslab.c index 6aa5e063f..a8b4b0a0e 100644 --- a/module/zfs/metaslab.c +++ b/module/zfs/metaslab.c @@ -2120,4 +2120,8 @@ MODULE_PARM_DESC(metaslab_debug_load, "load all metaslabs during pool import"); module_param(metaslab_debug_unload, int, 0644); MODULE_PARM_DESC(metaslab_debug_unload, "prevent metaslabs from being unloaded"); + +module_param(zfs_mg_noalloc_threshold, int, 0644); +MODULE_PARM_DESC(zfs_mg_noalloc_threshold, + "percentage of free space for metaslab group to allow allocation"); #endif /* _KERNEL && HAVE_SPL */ |