UNIX admin wrote:
My question is how efficient will ZFS be, given that
it will be layered on top of the hardware RAID and
write cache?
ZFS delivers best performance when used standalone, directly on entire disks.
By using ZFS on top of a HW RAID, you make your data susceptible to HW errors
caused by the storage subsystem's RAID algorithm, and slow down the I/O.
This is simply not true. ZFS would protect against the same type of
errors seen on an individual drive as it would on a pool made of HW raid
LUN(s). It might be overkill to layer ZFS on top of a LUN that is
already protected in some way by the devices internal RAID code but it
does not "make your data susceptible to HW errors caused by the storage
subsystem's RAID algorithm, and slow down the I/O".
True, ZFS can't manage past the LUN into the array. Guess what? ZFS
can't get past the disk drive firmware either....and thats a good thing
for all parties involved.
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