Am 19.02.10 19:30, schrieb Bob Friesenhahn:
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.
Too bad, I'm getting ~1000 IOPS with an Intel X25-M G2 MLC and around
300 with a regular USB stick, so 50 IOPS is really poor for an SLC SSD.
Bob
- Felix
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