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?


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