As per the title :) I have 23 OSD spinners on 5 hosts, Data+WAL+DB all
on the disk. All VM's are windows running with Writeback Cache.
Performance is adequate but see occasional high IO loads that make the
VM's sluggish.
With a lot of work I could move the WAL/DB to separate SSD partitions,
or use lvmcache, which looks to be more transparent to setup.
TBH, write performance could be better, as could IOPS :) The Ethernet
connections never comes close to being saturated, so I'm guessing write
speed of the disks is the limiting factor.
I'm tending towards separate WAL/DB devices as I prefer to work within
the recommended usages of projects such as Ceph these days, rather than
trying to outguess their design parameters.
Any experiences either way on the list?
--
Lindsay
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