Hello everyone,
I'm wondering if the following makes sense:
To configure a system for high IOPS, I want to have a zpool of 15K RPM SAS
drives. For high IOPS, I believe it is best to let ZFS stripe them, instead
of doing a raidz1 across them. Therefore, I would like to mirror the drives
for reliability.
Now, I'm wondering if I can get away with using a large capacity 7200 RPM
SATA drive as mirror for multiple SAS drives. For example, say I had 3 SAS
drives of 150 GB each. Could I take a 500 GB SATA drive, partition it into
3 vdevs and use each one as a mirror for one SAS drive? I believe this is
possible.
The problem is in performance. What I want is for all reads to go to the
SAS drives so that the SATA drive will only see writes. I'm hoping that due
to the copy-on-write nature of ZFS, the writes will get bunched into
sequential blocks, so write bandwidth will be good, even on a SATA drive.
But, the reads must be kept off the SATA drive. Is there any way I can get
ZFS to do that?
Thanks,
Monish
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