Geoff Jacobs wrote:
Jeff Layton wrote:
Remember that OCZ does not equal Fusion-IO :) There are many
factors that go into an SSD that determine performance. So the
performance of OCZ is not nearly that of Fusion-IO's product.
For example, I've been tracking some performance testing of a
wide variety of SSD's and spinning disks in my day job. Some of
the SSD's are fairly inexpensive, but the performance is pretty
pathetic. For example, if your read/write mix includes more than
about 10% writes, then the performance of the SSD's is worse
than a spinning disk (this is in terms of IOPS).
If you want to move up the food chain and buy some unbelievably
fast SSD's you get can get the performance above spinning disks
but the price is several orders of magnitude greater than spinning
disks.
Yeah, there's a few vendors out there selling battery backed dram
solutions. Basically maxing out the interface, but stupidly expensive.
>From the benches I've seen, though, it could be a useful accelerator for
workloads akin to databases.
It gets more involved than just adding dram. The controllers can
have a huge impact on performance. You will find some high-end
drives that have great NAND's but really crappy controllers. This
limits performance (I don't know if I've seen any with good
controllers and bad NAND's though, but I think there are some
out there). Then you have some amazing drives with great controllers
and great NAND's - but you will pay dearly for them :)
And as others have pointed out, the details of the firmware can
also have a big impact on performance. Also, the interface can
impact performance as well.
Jeff
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