On Dec 23, 2010, at 2:25 AM, Stephan Budach wrote: > as I have learned from the discussion about which SSD to use as ZIL drives, I > stumbled across this article, that discusses short stroking for increasing > IOPs on SAS and SATA drives: > > http://www.tomshardware.com/reviews/short-stroking-hdd,2157.html > > Now, I am wondering if using a mirror of such 15k SAS drives would be a > good-enough fit for a ZIL on a zpool that is mainly used for file services > via AFP and SMB.
SMB does not create much of a synchronous load. I haven't explored AFP directly, but if they do use Berkeley DB, then we do have a lot of experience tuning ZFS for Berkeley DB performance. > I'd particulary like to know, if someone has already used such a solution and > how it has worked out. Latency is what matters most. While there is a loose relationship between IOPS and latency, you really want low latency. For 15krpm drives, the average latency is 2ms for zero seeks. A decent SSD will beat that by an order of magnitude. -- richard
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