[DRBD-user] DRBD metadata issue + replacing a disk

Ammar Sheikh Saleh aalishe at gmail.com
Thu Oct 15 14:02:18 CEST 2015

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


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)


On Thu, Oct 15, 2015 at 2:34 PM, Lars Ellenberg <lars.ellenberg at linbit.com>
wrote:

> 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 11:07:23 lws1h1 kernel: EXT4-fs error (device drbd1):
> ext4_mb_generate_buddy: EXT4-fs: group 3785: 27507 blocks in bitmap, 27576
> in gd
> > Jan  5 11:07:53 lws1h1 kernel: EXT4-fs error (device drbd1):
> ext4_mb_generate_buddy: EXT4-fs: group 2437: 9219 blocks in bitmap, 32546
> in gd
> > Jan  5 11:07:53 lws1h1 kernel: EXT4-fs error (device drbd1):
> ext4_mb_generate_buddy: EXT4-fs: group 2438: 9075 blocks in bitmap, 32760
> in gd
> > Jan  5 11:07:53 lws1h1 kernel: EXT4-fs error (device drbd1):
> ext4_mb_generate_buddy: EXT4-fs: group 2442: 9078 blocks in bitmap, 32768
> in gd
> > Jan  5 20:18:27 lws1h1 kernel: JBD: Spotted dirty metadata buffer (dev =
> drbd1, blocknr = 0). There's a risk of filesystem corruption in case of
> system crash.
> > 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.
> __
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