Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Thanks Lars for the detailed answer and explanation.... and thanks Trevor On Thu, Oct 15, 2015 at 4:34 PM, Lars Ellenberg <lars.ellenberg at linbit.com> wrote: > On Thu, Oct 15, 2015 at 03:02:18PM +0300, Ammar Sheikh Saleh wrote: > > > "JBD: Spotted dirty metadata buffer" turns up several bugzillas from > > > 2010 and 2012, suggesting kernel upgrade would help. > > > > When ==> During normal operation > > > > What's the IO stack below DRBD ==> 4 Disks in JBOD > > > > Kernel upgrade is not possible now ... but at the same time its not too > > old ( v.2.6.32-431.20.3) > > What the message is complaining about is that JBD (the journaling > component of ext*) detects a buffer that is "dirty" (under write-out), > when it did not expect it to be. > > This all happens before any IO request related to that buffer even > reaches the block layer or DRBD. > > Maybe you have some "live dump" going on or do some other "unexpected" > (by JBD) things. Or your kernel simply still has some bug/race in the > related IO paths. > > In any case, this has nothing to do with DRBD, as the error message > complains about something happening in the buffer/page cache, > which is *above* DRBD. > > So whatever happens there, would happen just the same, even without DRBD. > (Though, of course, DRBD changes timings and memory pressure, so it may > make it more or less likely to trigger this). > > > > On Thu, Oct 15, 2015 at 12:32:11PM +0300, Ammar Sheikh Saleh wrote: > > > > Hi all, > > > > > > > > I have one cluster with 2 nodes in active-active - master/slave setup > > > > > > > > I see the following error messages in the system logs: > > > > > > *when*. > > > > > > After a hard crash? > > > After a simulated Crash? > > > After a switchover? > > > After a failover? > > > During normal operation? > > > > > > What's the IO stack below DRBD? > > > > > > > Jan 5 22:02:18 lws1h1 kernel: EXT4-fs error (device drbd1): > ext4_mb_generate_buddy: EXT4-fs: group 3795: 32532 blocks in bitmap, 29780 > in gd > > > > Jan 5 22:02:19 lws1h1 kernel: JBD: Spotted dirty metadata buffer > (dev = drbd1, blocknr = 0). There's a risk of filesystem corruption in case > of system crash. > > > > > > > > What is the appropriate action to fix this issue > > > > > > Did you even google for the message? > > > "JBD: Spotted dirty metadata buffer" turns up several bugzillas from > > > 2010 and 2012, suggesting kernel upgrade would help. > > > -- > : Lars Ellenberg > : http://www.LINBIT.com | Your Way to High Availability > : DRBD, Linux-HA and Pacemaker support and consulting > > DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. > __ > please don't Cc me, but send to list -- I'm subscribed > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20151015/2c1d0a98/attachment.htm>