[Debian-ha-maintainers] Bug#760896: drbd8-utils: On-line device verification fails with high syncer rate

[Apollon Oikonomopoulos]

Control: reassign -1 linux
Control: retitle -1 drbd: sock_sendmsg time expired during on-line verification

Hi Eduardo,

Apologies for the late reply.

On 02:10 Tue 09 Sep     , Eduardo Díaz Rodríguez wrote:
> The new version if you put more than 30% of the network bandwidth and 
> send a
> verifcation of a sync drbd fails with the error:
> 
> Sep  7 03:14:43 servidorup1 kernel: [17480.223197] block drbd0:
> [drbd0_worker/5379] sock_sendmsg time expired, ko = 4294967295
> Sep  7 03:14:49 servidorup1 kernel: [17486.220589] block drbd0:
> [drbd0_worker/5379] sock_sendmsg time expired, ko = 4294967294
> Sep  7 03:14:55 servidorup1 kernel: [17492.217804] block drbd0:
> [drbd0_worker/5379] sock_sendmsg time expired, ko = 4294967293

This is a bug in the kernel DRBD module, not the DRBD userspace 
utilities. More info about that can be found at:

http://www.gossamer-threads.com/lists/drbd/users/25868

Switching to an adaptive sync rate might help, as suggested here:

http://www.novell.com/support/kb/doc.php?id=7009306

Note that DRBD 8.4.4 that does not suffer from this issue is not part of 
Linux mainstream yet, and so will not be shipped with jessie.

Regards,
Apollon