Hi,
from what I understood from negative experience with a 12-drive SSD RAID
set build with MDRaid on linux, and from answers to a related question I
raised recently in this list, it is not so easy to engineer a
configuration using a large count of SSDs anyhow. The budget option,
using SATA SSDs, seems to be critical in some terms. Using an SSD type
based on a controller using compression seems to be a suboptimal choice
for any data that will not compress efficiently (which is more likely
writing as a stripe set (RaidZn)). Other concern seems to be SATA vs SAS
in general, and compatibility of SATA SSDs with the usual SAS HBAs and -
Extenders.
One should be aware that any of these aspects is prone to make the vdev
unresponsible, or even kick drives out of the vdev. Should that be a
systematic issue, the stripe set will not rebuild properly or even be
lost in an instant, with no parity level offering protection.
Another option could be to look into a setup that is using a SLC or
RAM-based ZIL device, and/or a large SSD based L2ARC. That's what I am
looking into, currently.
BR
Sebastian
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