On Sun, Jul 22, 2012 at 4:14 PM, Craig Sanders <cas@taz.net.au> wrote:
On Sun, Jul 22, 2012 at 03:12:22PM +1000, Brett Pemberton wrote:
My current system has 2 x 64GB SSDs for OS, and a ZIL (mirrored) and
is the ZIL mirrored, or just the OS partitions?
Right now, the entire block devices are mirrored. So yes, the ZIL is. And I'm not really intending on putting in a read cache, as I doubt it'll match my use-case. I wouldn't expect a speed up, and performance isn't my goal anyway.
like md raid, you won't see an increase in filesystem capacity until all drives in a zdev (not the entire pool, the zdev) have been upgraded.
Ahh, I caught the wrong end of a stick, and assumed otherwise. Re-reading said stick, I believe the point at hand was JBOD, basically, so in that case you would see the increase on a replace. Bit disappointing, as I had chalked that down as a major advantage over mdadm. I'm still confused as to why zpool list showed an increase in capacity after the replace operation. Thinking about it further, I believe my best compromise might be to add one more drive into a 5.25 bay, and do: 3 x raidz, each with 3 drives. [500,500,500], [500,500,500], [1500,500,500] ~ 3tb And if I replace the two drives in the last vdev with the best bang for buck right now, 2tb, this will jump to 5.5tb (guessing) Giving me a fully populated max of 12tb. Seems a nice mix of upgrade-ability, storage and redundancy to me. cheers, / Brett