Richard Elling wrote:
On Jan 28, 2016, at 1:09 AM, Ian Collins <[email protected]
<mailto:[email protected]>> wrote:
It isn't usually a good idea to put both log and cache on the same
SSD. Unless you are using your SmartOS box as file server, ditch the
cache and just use a log device, the whole SSD, not a partition. It
also isn't a good idea to use an SSD without power fail protection
for a log.
FWIW, this is becoming less true as SSDs improve. In the bad old days,
some SSDs were much better
at write-intensive workloads (orders of magnitude). Today, there are
many SSDs that do well for both
read and write-intensive workloads and the difference between
write-intensities is the amount of OOB
overprovisioning. Since you can usually influence overprovisioning
yourself, this reduces the need for
separate devices.
I assume that you would still recommend against using SSDs without power
fail protection for log devices?
--
Ian.
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