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authorNeilBrown <neilb@suse.de>2008-02-06 12:39:52 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 21:41:18 +0300
commitc620727779f7cc8ea96efb71f0651a26349e59c1 (patch)
tree777abdad9c9ef10cb4df5c0efc736e6c64851ed8 /Documentation
parentc303da6d713b87b7b3f999f5acce8ecc76ff1adb (diff)
downloadlinux-c620727779f7cc8ea96efb71f0651a26349e59c1.tar.xz
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')
-rw-r--r--Documentation/md.txt10
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