[DRBD-user] DM to Linstor migration issue

[Roland Kammerer]

On Tue, Aug 21, 2018 at 05:55:15PM +0200, Roberto Resoli wrote:
> Il 21/08/2018 11:23, Robert Altnoeder ha scritto:
> > On 08/21/2018 09:23 AM, Yannis Milios wrote:
> > > Checked the error reports that are listed by using the 'linstor
> > > error-reports list', and I can see multiple occurrences of the
> > > following error:
> > > Description:
> > >      Initialization of storage for resource 'vm-115-disk-1' volume 0 failed
> > > Cause:
> > >      Storage volume 0 of resource 'vm-115-disk-1' too large. Expected
> > > 33561640KiB, but was : 33587200KiB.
> 
> more or less the same here
> 
> === /var/log/linstor-satellite/ErrorReport-5B7BC584-000001.log ===
> Error message:                      Initialization of storage for resource
> 'vm-101-disk-2' volume 0 failed
> Error message:                      Storage volume 0 of resource
> 'vm-101-disk-2' too large. Expected 104880044KiB, but was : 104960000KiB.
> 
> 
> > I guess that may have been caused by a different peer count in drbdmanage.
> > Volumes are defined by net size (usable size) in drbdmanage and LINSTOR,
> > but the actual backend storage is larger than the net size due to
> > internal DRBD meta data. One of the factors that the size of DRBD meta
> > data depends on is the number of peer slots.
> 
> I checked with
> 
> lvs --units k
> 
> and the size was as reported by linstor-satellite error report (after "but
> was:")
> 

Do you still have the migration script? Could you post the part for that
resource? Would be interesting which value the script tried to set.

Anything uncommon? Did you change the max number of peers or anything?

It is good hat there is a fix and you guys managed to migrate. I still
wonder why this did not trigger in my tests.

Regards, rck