Hi Oleg, thank you very much for your post, it's really didactic. We are taking a different approach for HA at storage level, but I have worked formerly with DRBD and I think it's a very good choice.
I'm curious about how you have deployed nova-volume nodes in your architecture. You don't specify if the two nodes of the DRBD cluster run one or two instances of nova-volume. If you run one instance probably you have implemented some kind of fault-tolerant active-passive service if the nova-volume process fails in the active node, but I would like to know if you can run an active-active two nova-volume instances on two different physical nodes on top of the DRBD shared resource. Regards Diego -- Diego Parrilla <http://www.stackops.com>*CEO* *www.stackops.com | * [email protected]** | +34 649 94 43 29 | skype:diegoparrilla* * <http://www.stackops.com> On Thu, May 26, 2011 at 1:29 PM, Oleg Gelbukh <[email protected]> wrote: > Hi, > We were researching Openstack for our private cloud, and want to share > experience and get tips from community as we go on. > > We have settled on DRBD as shared storage platform for our installation. > LVM is used over the drbd device to mange logical volumes. OCFS2 file system > is created on one of volumes, mounted and set up as *image_path* and * > instance_path* in the *nova.conf*, other space is reserved for storage > volumes (managed by nova-volume). > > As a result, we have shared storage suitable for features such as live > migration and snapshots. We also have some level of fault-tolerance, with > DRBD I/O error handling, which automatically redirects I/O requests to peer > node over network in case of primary node failure. We created > script<https://github.com/Mirantis/openstack-utils/blob/master/recovery_instance_by_id.py>for > bootstrapping lost VMs in two crash scenarios: > * dom0 host restart/domU failure: restore VMs on the same host > * dom0 host failure: restore VMs on peer node > We are considering such pair of servers with shared storage as a basic > block for the cloud structure. > > For whom it may interest, the details of DRBD installation are > here<http://mirantis.blogspot.com/2011/05/shared-storage-for-openstack-based-on.html>. > I'll be glad to answer any questions and highly appreciate feedback on this. > > Oleg S. Gelbukh, > Mirantis Inc. > www.mirantis.com > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > >
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