Of the two, pacemaker is far, far safer from a cinder PoV - fewer races, fewer problematic scenarios.
On 15 September 2015 at 17:59, D'Angelo, Scott <scott.dang...@hpe.com> wrote: > Eduard, Gorka has done a great job of explaining some of the issues with > Active-Active Cinder-volume services in his blog: > > http://gorka.eguileor.com/ > > > > TL;DR: The hacks to use the same hostname or use Pacemaker + VIP are > dangerous because of races, and are not recommended for Enterprise > deployments. > > > > *From:* Eduard Matei [mailto:eduard.ma...@cloudfounders.com] > *Sent:* Tuesday, September 15, 2015 8:54 AM > *To:* OpenStack Development Mailing List (not for usage questions) > *Subject:* Re: [openstack-dev] [Cinder]Behavior when one cinder-volume > service is down > > > > Hi, > > > > Let me see if i got this: > > - running 3 (multiple) c-vols won't automatically give you failover > > - each c-vol is "master" of a certain number of volumes > > -- if the c-vol is "down" then those volumes cannot be managed by another > c-vol > > > > What i'm trying to achieve is making sure ANY volume is managed > (manageable) by WHICHEVER c-vol is running (and gets the call first) - sort > of A/A - so this means i need to look into Pacemaker and virtual-ips, or i > should try first the "same name". > > > > Thanks, > > > > Eduard > > > > PS. @Michal: Where are volumes physically in case of your driver? <- > similar to ceph, on a distributed object storage service (whose disks can > be anywhere even on the same compute host) > > __________________________________________________________________________ > OpenStack Development Mailing List (not for usage questions) > Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > -- -- Duncan Thomas
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