On Fri, 19 Feb 2010, Felix Buenemann wrote:
So it is apparent, that the SSD has really poor random writes.
But I was under the impression, that the ZIL is mostly sequential writes or
was I misinformed here?
Maybe the cache syncs bring the device to it's knees?
That's what it seems like. This particular device must actually being
obeying the cache sync request rather than just pretending to like
many SSDs.
Most SSDs are very good at seeking, and very good at random reads, but
most are rather poor at small synchronous writes. The ones which are
good at small synchronous writes cost more.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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