Erik Trimble wrote:
I just looked at pricing for the higher-end MLC devices, and it looks
like I'm better off getting a single drive of 2X capacity than two
with X capacity.
Leaving aside the issue that by using 2 drives I get 2 x 3.0Gbps SATA
performance instead of 1 x 3.0Gbps, are there problems with using two
slices instead of whole-drives? That is, one slice for Read and the
other for ZIL?
My main concern is exactly how the on-drive cache would be used in a
two-slices configuration. In order to get decent performance, I really
need the on-drive cache to be used properly.
Is the on-disk cache volatile? For most SSDs I'm familiar with, the on-disk
cache is non-volatile, so all of the rules pertaining to whole disks with
volatile write buffers are nullified.
-- richard
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