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| author | NeilBrown <neilb@suse.de> | 2008-02-06 01:39:52 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:18 -0800 |
| commit | c620727779f7cc8ea96efb71f0651a26349e59c1 (patch) | |
| tree | 777abdad9c9ef10cb4df5c0efc736e6c64851ed8 /Documentation/md.txt | |
| parent | c303da6d713b87b7b3f999f5acce8ecc76ff1adb (diff) | |
| download | lwn-c620727779f7cc8ea96efb71f0651a26349e59c1.tar.gz lwn-c620727779f7cc8ea96efb71f0651a26349e59c1.zip | |
md: allow a maximum extent to be set for resyncing
This allows userspace to control resync/reshape progress and synchronise it
with other activities, such as shared access in a SAN, or backing up critical
sections during a tricky reshape.
Writing a number of sectors (which must be a multiple of the chunk size if
such is meaningful) causes a resync to pause when it gets to that point.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/md.txt')
| -rw-r--r-- | Documentation/md.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt index 5818628207b5..396cdd982c26 100644 --- a/Documentation/md.txt +++ b/Documentation/md.txt @@ -416,6 +416,16 @@ also have sectors in total that could need to be processed. The two numbers are separated by a '/' thus effectively showing one value, a fraction of the process that is complete. + A 'select' on this attribute will return when resync completes, + when it reaches the current sync_max (below) and possibly at + other times. + + sync_max + This is a number of sectors at which point a resync/recovery + process will pause. When a resync is active, the value can + only ever be increased, never decreased. The value of 'max' + effectively disables the limit. + sync_speed This shows the current actual speed, in K/sec, of the current |