On 11/01/2017 7:21 AM, Kevin Olbrich wrote:
Read-Cache using normal Samsung PRO SSDs works very well
How did you implement the cache and measure the results?
a ZFS ssd cache will perform very badly with VM hosting and/or
distriibuted filesystems, the random nature of the I/O and the ARC cache
essential render it useless. I never saw better than a 6% hit rate with
L2ARC.
Also if used as Journals or SSD Tiers, Samsung Pro have shocking write
performance.
ZFS is probably not optimal for Ceph, but regardless of the underlying
file system, with a 5 Node, 2G, Replica 3 setup you are going to see
pretty bad write performance.
POOMA U - but I believe that linked clones, especially old ones are
going to be pretty slow.
--
Lindsay Mathieson
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