> measurable benefits for caching local disks as well? NAND-flash SSD
I'm confused, the only reason I can think of making a
To create a pool with cache devices, specify a "cache" vdev
with any number of devices. For example:
# zpool create pool c0d0 c1d0 cache c2d0 c3d0
Cache devices cannot be mirrored or part of a raidz confi-
guration. If a read error is encountered on a cache device,
that read I/O is reissued to the original storage pool dev-
ice, which might be part of a mirrored or raidz
configuration.
The content of the cache devices is considered volatile, as
is the case with other system caches.
device non-volatile was to fill the ARC after reboot, and the in ram
ARC pointers for the cache device will take quite abit of ram too, so
perhaps spending the $$ on more system ram rather than a SSD cache
device would be better? unless you have really slow iscsi vdevs :-)
Rob
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