Hello Cephers,
I'm planing hardware environment, I want to use CEPH for VM's which will
be managed by OpenStack. So far, in my virtualized DEV cloud, all looks
great, OpenStack works well with KVM + CEPH, but I want to increase
performance with SSD's. Full SSD CEPH cluster will be too expensive and
I am looking more for Cache Tiering or setting up journals to use SSD's,
but last only increase writes.
Which setup would be preferred when CEPH is used as RBD for VM's?
Few days back was discussion in mailing list, that Cache Tiering
(probably) corrupt VM's images. Are any other people who successfully
use Cache Tiering with virtualization and can share experience?
Is it possible to use one cache pool for multiple "cold" pools? For
example, to use one cache pool for cinder volume pool and nova vm's pool?
Maybe better use case is to setting up journals on SSD's and create
Cache Tier pool with read-only for volumes and vm's, so it should
increase both reads and writes?
What other tips community can give in a way to "hybrid" CEPH cluster
which will mainly use as RBD for VM's?
Best regards,
Martins
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