[DRBD-user] kernel panic with rhel 5.4, drbd 8.3.2 (and 4k hard sector size on lower level device)

atp Andrew.Phillips at lmax.com
Fri Feb 26 16:03:24 CET 2010

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


The patch to 8.3.7 worked like a charm.

[root at drvms03 ~]# drbdadm attach vm1
[ 3069.155936] block drbd0: Meta data's bdev logical_block_size = 4096 !
= 512
[ 3069.238533] block drbd0: Workaround engaged (has performance impact).
[ 3069.317985] block drbd0: No usable activity log found.

In case anyone else is searching for this solution, the storage array
was a thecus 8800 pro with 4kb iscsi block size set causing the
following kernel panic
Unable to handle kernel NULL pointer dereference at 0000000000000000
 [<ffffffff8002de3c>] blk_recount_segments+0x74/0x36f

 Thanks again.

Andrew Phillips
Head of Systems


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