diff options
| author | madduck <madduck@3cfab66f-1918-0410-86b3-c06b76f9a464> | 2007-01-13 13:17:40 +0000 |
|---|---|---|
| committer | madduck <madduck@3cfab66f-1918-0410-86b3-c06b76f9a464> | 2007-01-13 13:17:40 +0000 |
| commit | 7b441f9817760cc6743c3920199bc36716519e0d (patch) | |
| tree | 37ab53f0c4c63261390b3341653b8215b1c4c9db /debian/FAQ | |
| parent | 658f831dad3c3fc3029c8d1e8420cdbb369b2caa (diff) | |
added sync delay note
Diffstat (limited to 'debian/FAQ')
| -rw-r--r-- | debian/FAQ | 21 |
1 files changed, 19 insertions, 2 deletions
@@ -496,14 +496,31 @@ The latest version of this FAQ is available here: I'll leave it up to you to figure things out. Now go read question 19. -21. Why does the kernel speak of 'resync' when using checkarray -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +21. Why does the kernel speak of 'resync' when using checkarray? +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Please see README.checkarray and http://www.mail-archive.com/linux-raid@vger.kernel.org/msg04835.html . In short: it's a bug. checkarray is actually not a resync, but the kernel does not distinguish between them. +22. Can I prioritise the sync process and sync certain arrays before others? +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + Upon start, md will resynchronise any unclean arrays, starting in somewhat + random order. Sometimes it's desirable to sync e.g. /dev/md3 first (because + it's the most important), but while /dev/md1 is synchronising, /dev/md3 will + be DELAYED (see /proc/mdstat; only if they share the same physical + components. + + It is possible to delay the synchronisation via /sys: + + echo idle >/sys/block/md1/md/sync_action + + This will cause md1 to go idle and md to synchronise md3 (or whatever is + queued next; repeat the above for other devices if necessary). md will also + realise that md1 is still not in sync and queue it for resynchronisation, + so it will sync automatically when its turn has come. + -- martin f. krafft <madduck@debian.org> Thu, 08 Jan 2007 01:04:03 +0200 $Id$ |