On Mon, 28 May 2012 00:10:33 +0800 Igor M Podlesny <for.poige+lsr@xxxxxxxxx> wrote: > On 27 May 2012 20:00, NeilBrown <neilb@xxxxxxx> wrote: > > On Sun, 27 May 2012 19:32:40 +0800 Igor M Podlesny <for.poige+lsr@xxxxxxxxx> > > wrote: > >> A power outage has happened to system (which was in "suspend" > >> state) with RAID-10, RAID-5 and RAID-6. Later on boot, RAID-10 was > >> fast re-synced using bitmap, but both RAID-5 and RAID-6 were in > >> auto-readonly mode with resync=DELAYED. When they flipped to > >> Read-Write, LSR started re-syncing not using bitmaps seemingly. A bug? > > > > Maybe. But with so little detail it is hard to say. > > What made you think the bitmaps weren't being used? > > Well, it is reasonable to assume that host being put in suspend > mode wouldn't have much not synced data at all. RAID-10 had been > progressing its resync quite fast, it was obvious that it had been > using bitmaps for that. Moreover — RAID-10 was the most I/O active > comparing to others, AFAIR. Unfortunately vague statements about "it was obvious" or "AFAIR" don't really help in analysing a situation to find any bugs. I can only really work with concrete facts. Without them I cannot help. > > > Did that arrays still have their bitmaps? > > I still have that RAID-6, yep: > > md127 : active raid6 sdg5[2] sdf5[6] sde5[7] sda5[0] sdd5[3] sdc5[1] > 1071984640 blocks super 1.0 level 6, 1024k chunk, algorithm 2 > [6/6] [UUUUUU] > bitmap: 0/1 pages [0KB], 131072KB chunk > > > Where they degraded? > > No way. > > > How many bits were set in the bitmaps (probably too late to check now)? > > Please see above. And the RAID-5 one was recently dismissed, alas. > > > Is it reproducable ? ... OK, I don't really expect you to try to reproduce > > it, but if you could that would be awesome! > > Well, might be VirtualBox would allow for such kind of experiment, dunno. ) > > P. s. Oh, and BTW, I see 2.6.18 supplied by RedHat still has the > bug causing kernel panic when using WIB -- couldn't you please point > out is it due to they're missing some important bugfix you made later? I have no time or interest for submiting bug reports to distros that I don't use. If the presence of the bug concerns you, I suggest you report it. NeilBrown > > --
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