Hi,
I have a small, 3 node Firefly cluster. Each node hosting 6 OSDs, a 3 TB
spinner each. Each host has 2 SSDs used for the journals. Also each host
has 4 SSDs used as a 2 x RAID1 CacheCade array. The cluster is used to
host KVM based virutal machines, about 180 now. I'm thinking about
migrating from the CacheCade arrays to Ceph's cache tiering but I don't
have any relevant experience with it. I'm cosindering two options: 1)
the hardware setup stays the same and the 12 SSDs will be converted to
the cache pool; 2) I'll move those SSDs into the KVM hosts and fill up
the rest empty slots, making 20 SSDs in total and use them as the cache
pool - this way I'll have 3 x 4 slots for spinners in the cluster. I'm
not sure how should I assess the needs. Right now the CacheCade is doing
well most of the time, but I don't like the idea of a local cache and it
is not expandable. Also during peak times the CacheCade solution seems
to be inadequate.
Your experiences or some suggestions based upon my description would be
very welcomed.
Best regards,
Mate
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