diff options
| author | David Sterba <dsterba@suse.com> | 2017-03-31 19:40:05 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-03-31 19:40:05 +0200 |
| commit | 4a1d07e8c3ae610c863e57ee31e1484d652367ea (patch) | |
| tree | 11a7f9a41a494f8ff2ac2bd2b05c6aa9508addb9 /Documentation | |
| parent | bd0ab27afbf14370f9f0da1f5f5ecbb0adc654c1 (diff) | |
btrfs-progs: docs: mount options, enhance ssd/nossd
Reported-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/btrfs-man5.asciidoc | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/Documentation/btrfs-man5.asciidoc b/Documentation/btrfs-man5.asciidoc index c8ef1c96..fe3cb92a 100644 --- a/Documentation/btrfs-man5.asciidoc +++ b/Documentation/btrfs-man5.asciidoc @@ -348,19 +348,20 @@ If a version is not explicitly specified, the default implementation will be chosen, which is 'v1' as of 4.9. *ssd*:: -*nossd*:: *ssd_spread*:: +*nossd*:: (default: SSD autodetected) + Options to control SSD allocation schemes. By default, BTRFS will enable or disable SSD allocation heuristics depending on whether a -rotational or non-rotational disk is in use (contents of -'/sys/block/DEV/queue/rotational'). The 'ssd' and 'nossd' options -can override this autodetection. +rotational or non-rotational device is in use (contents of +'/sys/block/DEV/queue/rotational'). If it is, the 'ssd' option is turned on. +The option 'nossd' will disable the autodetection. + The 'ssd_spread' mount option attempts to allocate into bigger and aligned chunks of unused space, and may perform better on low-end SSDs. 'ssd_spread' -implies 'ssd', enabling all other SSD heuristics as well. +implies 'ssd', enabling all other SSD heuristics as well. The option 'nossd' +will disable all SSD options. *subvol='path'*:: Mount subvolume from 'path' rather than the toplevel subvolume. The |