--On 24 May 2010 23:41 -0400 rwali...@washdcmail.com wrote:
I haven't seen where anyone has tested this, but the MemoRight SSD (sold by RocketDisk in the US) seems to claim all the right things: http://www.rocketdisk.com/vProduct.aspx?ID=1 pdf specs: http://www.rocketdisk.com/Local/Files/Product-PdfDataSheet-1_MemoRight%20 SSD%20GT%20Specification.pdf They claim to support the cache flush command, and with respect to DRAM cache backup they say (p. 14/section 3.9 in that pdf):
At the risk of this getting a little off-topic (but hey, we're all looking for ZFS ZIL's ;) We've had similar issues when looking at SSD's recently (lack of cache protection during power failure) - the above SSD's look interesting [finally someone's noted you need to protect the cache] - but from what I've read about the Intel X25-E performance - the Intel drive with write cache turned off appears to be as fast, if not faster than those drives anyway...
I've tried contacting Intel to find out if it's true their "enterprise" SSD has no cache protection on it, and what the effect of turning the write cache off would have on both performance and write endurance, but not heard anything back yet.
Picking apart the Intel benchmarks published - they always have the write-cache enabled, which probably speaks volumes...
-Karl _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
