[Drbd-dev] DRBD 8.4.3 : create-md possibly broken for fixed sized (shared) meta devices

[Tijs Van Buggenhout]

On Thursday 07 March 2013 10:31:37 Lars Ellenberg wrote:
> On Wed, Mar 06, 2013 at 03:24:36PM +0100, Tijs Van Buggenhout wrote:
> > Hi,
> > 
> > I recently installed drbd 8.4.3 packages and ran into problems when trying
> > to create a drbd resource using fixed size drbd meta device ided by an
> > index. Investigating further, it seems that when using a flexible meta
> > disk, there is no problem whatsoever.
> > I also used the same configuration file/set of commands on the previous
> > version (8.4.2) for fixed size meta-disk, which worked without problems.
> > 
> > The following excerpt from the console log shows how I first create a drbd
> > resource (drbd0) with flexible meta disk (/dev/lv/drbd-meta-84).
> > Afterwards I undo the configuration, and try to do the same for fixed
> > drbd meta disk, which fails (every time). Then I roll back to the
> > previous version of drbd utils/module, and try the setup with fixed drbd
> > meta disk again, which succeeds.
> > 
> > resource drbd0 {
> > 
> >         on master.domain.com {
> >         
> >                 device /dev/drbd0;
> >                 disk /dev/lv/data;
> >                 address 172.16.1.179:7788;
> >                 meta-disk /dev/lv/drbd-meta-84 [0];
> > 
> > (master.domain.com):~# dd if=/dev/zero of=/dev/lv/drbd-meta-84
> > bs=$[1024*1024] (master.domain.com):~# modprobe drbd
> > (master.domain.com):~# cat /proc/drbd
> > version: 8.4.3 (api:1/proto:86-101)
> > GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by root at build,
> > 2013-03-05 15:10:01
> > (master.domain.com):~# drbdsetup new-resource drbd0
> > (master.domain.com):~# drbdsetup new-minor drbd0 /dev/drbd0 0
> > (master.domain.com):~# drbdadm create-md drbd0 -vvvvvvvvvv
> > (master.domain.com):~# drbdadm attach drbd0
> > 0: Failure: (119) No valid meta-data signature found.
> > 
> >         ==> Use 'drbdadm create-md res' to initialize meta-data area. <==
> 
> D'oh.
> That is embarrassing.
> 
> I wonder why the regression tests using "old style indexed fixed size
> external meta data" have not been exercised.
> 
> http://git.drbd.org/gitweb.cgi?p=drbd-8.4.git;a=commitdiff;h=82cf5feada2e4d0
> f536af5f6f377bd0f3fac1236
> 
> Thanks,

Patch is working, thanks for the quick response/fix!

Is a new release of drbd 8.4 series to be expected in the near future?

Regards,
Tijs