[DRBD-user] Error when trying to mount drbd partition : 'Bad geometry: block count xxx exceeds size of device'

Lars Ellenberg lars.ellenberg at linbit.com
Thu Oct 8 13:05:34 CEST 2009

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

On Wed, Oct 07, 2009 at 03:58:01PM -0700, clipclop wrote:
> >Ah.
> >What size is your meta data area?
> >What size is the resulting DRBD?
> >-> cat /proc/partitions,
> >compare drbd0 and your lower level device.
> >
> >You'd need ~196 MiB meta data (bitmap area) for ~6 TB storage.
> Meta-data area 256 MB so no problem there.
> I just upgraded linux kernel+headers+etc to (fc11.x86_64) and
> recompiled DRBD 8.3.4 from scratch to this kernel.
> Completely zeroed out external meta-data partition, then reran 'drbdadm
> create-md' command.
> Started DRBD service.
> Running 'cat /proc/partitions'   shows the following sizes :
>   5807677440 dm-0  (logical backing volume for DRBD)
>   4293787648 drbd0
> As usual, when mounting drbd0 I receive the same error message about invalid
> superblock, and 1 line in /var/log/messages is logged:
> kernel: EXT4-fs: bad geometry: block count 1451919360 exceeds size of device
> (1073446912 blocks)
> What could cause the discrepancy between the logical and DRBD volume sizes ?

Do you use "flexible-meta-disk" ? if not, then thats your problem.
the "meta-disk device[index]" method uses strictly 128 MiB.

What does drbd log in kernel messages during attach?
there should be lines like "drbd_bm_resize called with capacity".

: Lars Ellenberg                
: LINBIT HA-Solutions GmbH
: DRBD®/HA support and consulting    http://www.linbit.com

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