Richard Elling wrote:
On Dec 25, 2009, at 4:15 PM, Erik Trimble wrote:
I haven't seen this mentioned before, but the OCZ Vertex Turbo is
still an MLC-based SSD, and is /substantially/ inferior to an Intel
X25-E in terms of random write performance, which is what a ZIL
device does almost exclusively in the case of NFS traffic.
ZIL traffic tends to be sequential on separate logs. But may be of
different sizes.
-- richard
Really? Now that I think about it, that seems to make sense - I was
assuming that each NFS write would be relatively small, but that's
likely not a valid general assumption. I'd still think that the
MLC-nature of the Vertex isn't optimal for write-heavy applications like
here, even with a modest SDRAM cache on the SSD.
In fact, I think that the Vertex's sustained random write IOPs
performance is actually inferior to a 15k SAS drive.
I read a benchmark report yesterday that might be interesting. It
seems that
there is a market for modest sized SSDs, which would be perfect for
separate
logs + OS for servers.
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=392&Itemid=60
-- richard
I'm still hoping that vendors realize that there definitely is a (very
large) market for ~20GB high write IOPS SSDs. I like my 18GB Zeus
SSD, but it sure would be nice to be able to pay $2/Gb for it, instead
of 10x that now...
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
Timezone: US/Pacific (GMT-0800)
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