Rainer Fügenstein <rfu@xxxxxxxxxx> writes: > Hello Neil, > > Sunday, October 25, 2015, 9:08:39 PM, you wrote: > >> Depending on kernel version, it will either work or it won't. > # mdadm --grow /dev/md0 --bitmap=none > mdadm: failed to remove internal bitmap. > md: couldn't update array info. -16 > > so it doesn't work with this kernel. will upgrade ASAP. > >> Either way, it won't cause harm. > famous last words ;-) > >> Weekly is a bit more often than I would go for, but why disable it? > because a resync runs for a bit more than two days. but running it > monthly seems to be a good trade-off. > >> That isn't a cronjob started resync. That would say "check" rather than >> 'resync". >> This looks a lot like a resync after an unclean restart. But with the >> bitmap that should go faster... > you've got me here. resync started at 04:22am, the same time as > cron.weekly. there was a 99-raid-something script in cron.weekly > (before I deleted it). system is up for some 2 days before the > resync, so no unclean restart. Hmmm... is your kernel older than 2.6.19? If so, that would explain it. Prior to 2.6.19, 'check' was reported as 'resync'. > >> What does "mdadm --examine-bitmap /dev/sdb1" report? > > # mdadm --examine-bitmap /dev/sdb1 > Filename : /dev/sdb1 > Magic : 6d746962 > Version : 4 > UUID : 8d3586a2:6adbc781:ee187e6d:500f9b34 > Events : 4945261 > Events Cleared : 4945261 > State : OK > Chunksize : 4 MB > Daemon : 5s flush period > Write Mode : Normal > Sync Size : 2930265344 (2794.52 GiB 3000.59 GB) > Bitmap : 715397 bits (chunks), 51 dirty (0.0%) 50% dirty! That is more than I would expect. So even if it was a real resync it would be going quite slowly. I guess you'll just have to wait it out. Maybe you could: echo idle > /sys/block/md0/md/sync_action That will abort a 'check'. If it restarts automatically, md thinks it was doing a real resync. If it doesn't you should be able to remove and re-add the bitmap. Then maybe check with --examine-bitmap again. But definitely update your kernel if you are on 2.6.something. NeilBrown > > hth. > > -- > Best regards, > Rainer mailto:rfu@xxxxxxxxxx
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