Hi,
we work with Openstack and Ceph as well, and we also support customers
with such deployments, but in 10 years I haven't had to rebuild any
object maps yet, ever. So I'm wondering what exactly you're seeing
when you do have to rebuild them.
One of our customers has a middle sized cloud (around 40 compute
nodes), and I'd say once or twice a year one of them dies. But we
never had to rebuild any object maps.
Our own Ceph cluster also started with Hammer, I believe, and around
that time we also started using Openstack (Kilo maybe?). The customer
I mentioned has been working with Openstack and Ceph even longer, long
before we came into play.
I guess my response is not really helpful to you, but I'm curious what
could make the difference here, why we are not experiencing object map
issues.
Regards,
Eugen
Zitat von Gary Molenkamp <molen...@uwo.ca>:
We use ceph rbd as a volume service for both an Openstack deployment
and a series of Proxmox servers. This ceph deployment started as a
Hammer release and has been upgraded over the years to where it is
now running Quincy. It has been fairly solid over that time, even
through upgrades from filestore to bluestore, and many transparent
hardware replacements/improvements.
One concern we have is that when we have a hypervisor that
unexpectedly dies/crashes, the volumes must always have the object
maps rebuilt. If we don't rebuild the object maps, the VMs will
either not boot, or we will have other side-effects that render the
volume unusable. (ie cannot mount root). Is this to be expected
during this type of event or have I missed a setting during one of
the many upgrade on our deployment?
Thankfully the above does not happen regularly, but we would like to
make use of the HA features of proxmox to ensure some VMs are always
available. Requiring the rebuild step limits what can be done
automatically, and how quickly it can be recovered.
Any advice on ceph configuration, or how others may adapt to the
requirements in HA situations would be appreciated.
Cheers,
Gary
--
Gary Molenkamp Science Technology Services
Systems Engineer University of Western Ontario
molen...@uwo.ca http://sts.sci.uwo.ca
(519) 661-2111 x86882 (519) 661-3566
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