Ross Walker wrote:
On Jul 5, 2009, at 6:06 AM, James Lever <j...@jamver.id.au> wrote:
On 04/07/2009, at 3:08 AM, Bob Friesenhahn wrote:
It seems like you may have selected the wrong SSD product to use.
There seems to be a huge variation in performance (and cost) with
so-called "enterprise" SSDs. SSDs with capacitor-backed write
caches seem to be fastest.
Do you have any methods to "correctly" measure the performance of an
SSD for the purpose of a slog and any information on others (other
than anecdotal evidence)?
There are two types of SSD drives on the market, the fast write SLC
(single level cell) and the slow write MLC (multi level cell). MLC is
usually used in laptops as SLC drives over 16GB usually go for $1000+
which isn't cost effective in a laptop. MLC is good for read caching
though and most use it for L2ARC.
Please don't classify them as MLC vs SLC or you'll find yourself totally
confused by the modern MLC designs which use SLC as a cache. Be
happy with specs: random write iops: slow or fast.
-- richard
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