On Thu, Apr 16, 2009 at 3:32 AM, Greg Mason <gma...@msu.edu> wrote: > > And it looks like the Intel fragmentation issue is fixed as well: >>> http://techreport.com/discussions.x/16739 >>> >> >> FYI, Intel recently had a new firmware release. IMHO, odds are that >> this will be as common as HDD firmware releases, at least for the >> next few years. >> http://news.cnet.com/8301-13924_3-10218245-64.html?tag=mncol >> > > It should also be noted that the Intel X25-M != the Intel X25-E. The X25-E > hasn't had any of the performance and fragmentation issues. > > The X25-E is an SLC SSD, the X25-M is an MLC SSD, hence the more complex > firmware. >
Yeah, that's what I understood. I assume based one what I've read and price on the sun site (11k NZD for 100G Readzilla 17.5k NZD for 18GB Logzilla) and that the Readizalla's a MLC device (need's more space) and the Logzilla is a SLC (latency and write speed requirements). Given latency is the biggest requirement, I'm wondering it would matter between the X25-E and X25-M for a slog. From the reviews I've read the latency seems to be pretty similar between the units. Of course size is not as important for a slog, and given the price for the 80GB -m and the 30GB -E is very similar it probably would be better to get the "enterprise" -E. Another question I'm considering is reliability of SSD units and the slog. Should a pair of X25-E be mirrored, or given that the pool can be booted without a slog device is it better to stripe the slog. Which leads into a second question about slogs - according to [1] as the stripe size increases for a pool the effectiveness of a SSD slog reduces. Is still the case? [1] http://blogs.sun.com/perrin/entry/slog_blog_or_blogging_on Nicholas
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