On Dec 17, 2009, at 9:04 PM, stuart anderson wrote:
As a specific example of 2 devices with dramatically different
performance for sub-4k transfers has anyone done any ZFS benchmarks
between the X25E and the F20 they can share?
I am particularly interested in zvol performance with a blocksize of
16k and highly compressible data (~10x).
16 KB recordsize? That seems a little unusual, what is the application?
I am going to run some comparison tests but would appreciate any
initial input on what to look out for or how to tune ZFS to get the
most out of the F20.
AFAICT, no tuning should be required. It is quite fast.
It might be helpful, e.g., if there where some where in the software
stack where I could tell part of the system to lie and treat the F20
as a 4k device?
The F20 is rated at 84,000 random 4KB write IOPS. The DRAM write
buffer will hide 4KB write effects.
OTOH, the X-25E is rated at 3,300 random 4KB writes. It shouldn't take
much armchair analysis to come to the conclusion that the F20 is likely
to win that IOPS battle :-)
-- richard
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