Hello!
I have built a OpenSolaris / ZFS based storage system for one of our
customers. The configuration is about this:
Motherboard/CPU: SuperMicro X7SBE / Xeon (something, sorry - can't
remember and do not have my specification nearby)
RAM: 8GB ECC (X7SBE won't take more)
Drives for storage: 16*1.5TB Seagate ST31500341AS, connected to two
AOC-SAT2-MV8 controllers
Drives for operating system: 2*80GB Intel X25-M (mirror)
ZFS configuration: Two vdevs, raid-z of 7+1 disks per set, striped
together (gives a zpool with about 21TB storage space)
Disk performance: around 700-800MB/s, tested and timed with 'mkfile' and
'time' (a 40GB file is created in just about a minute)
I have a spare X25-M drive of 40GB to use for cache or log (or both),
but since the disk array is a lot faster than the SSD-disk, I can not
see the advantage in using it as a cache device.
Is there any advantages for using a separate log or cache device in this
case ?
Regards,
PeO
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