[DRBD-user] 1 Primary Node

Lars Ellenberg lars.ellenberg at linbit.com
Thu Jul 15 11:14:17 CEST 2010

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

On Thu, Jul 15, 2010 at 09:58:13AM +0200, Lars Ellenberg wrote:
> On Thu, Jul 15, 2010 at 09:16:43AM +1000, adamn at eyemedia.com.au wrote:
> > Ok I didn't realise this was that kind of an issue, I just assumed DRBD 
> > wasn't happy with my setup due to the second node not being online.
> > The partition /dev/sdb1 is only set to about 40GB while I'm testing the 
> > setup, once I've nutted everything the machine will be rebuilt to have 
> > it's full capacity. (around 7TB) it's an LVM partition
> > 
> > I created a single Logical Volume around 20GB have it exported via 
> > iscsi-scst. 
> > 
> > Single VMWare ESXi server (again this is all testing this phase), setup 
> > iscsi to connect to the SAN (testing MPIO) as soon as I "scan" from the 
> > storage adapter I start getting the 
> > [28609.797320] block drbd1: al_complete_io() called on inactive extent 623 
> > 
> > ete..
> > 
> > see http://www.genis-x.com/files/syslog
> I never encountered that particular message,
> not in testing, not in production.
> I cannot remember any report of it, either.
> It indicates serious imbalance in reference counts of "active extents".
> So "something" is "special" with your setup.
> I suggest some sort of build inconsistency,
> so please double check a clean build of the
> DRBD module exactly fitting the kernel.
> Try to narrow it down.  Try to reproduce without going through the iSCSI
> layer first, accessing DRBD locally.  Try to reproduce with a "vanilla"
> kernel, using a different iSCSI target.

Or, of course, contact sales at LINBIT, checkout a suitable package,
and have us investigate and fix it.


Of course, DRBD issues get eventually fixed anyways,
once we can reproduce them. Currently we cannot, though.

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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