[DRBD-user] Uncatchable DRBD out-of-sync issue

Lars Ellenberg lars.ellenberg at linbit.com
Mon Mar 25 14:07:14 CET 2013

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

On Mon, Mar 25, 2013 at 12:20:20PM +0400, Stanislav German-Evtushenko wrote:
> Futher investigations...
> First vefification went well but then strange things started to happen.
> Full logs are here: http://pastebin.com/ntbQcaNz

... "Digest mismatch, buffer modified by upper layers during write" ...

You may want to read this (and following; or even the whole thread):

as well as the links mentioned there
| The Problem:
| http://lwn.net/Articles/429305/
| http://thread.gmane.org/gmane.linux.kernel/1103571
| http://thread.gmane.org/gmane.linux.scsi/59259

So you *possibly* have ongoing data corruption
caused by hardware, or layers above DRBD.

Or you may just have "normal behaviour",
and if DRBD was not that paranoid, you'd not even notice, ever.

Hard to know for sure from the distance.

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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