On Fri, Feb 19, 2010 at 2:17 PM, Felix Buenemann <felix.buenem...@googlemail.com> wrote: > > Am 19.02.10 20:50, schrieb Bob Friesenhahn: >> >> On Fri, 19 Feb 2010, David Dyer-Bennet wrote: >> >>>> Too bad, I'm getting ~1000 IOPS with an Intel X25-M G2 MLC and around >>>> 300 with a regular USB stick, so 50 IOPS is really poor for an SLC SSD. >>> >>> Well, but the Intel X25-M is the drive that really first cracked the >>> problem (earlier high-performance drives were hideously expensive and >>> rather brute force). Which was relatively recently. The industry is >>> still evolving rapidly. >> >> What is the problem is it that the X25-M cracked? The X25-M is >> demonstrated to ignore cache sync and toss transactions. As such, it is >> useless for a ZIL. > > Yes, I see no difference with the X25-M with both zfs_nocacheflush=0 and > zfs_nocacheflush=1. After setting zfs_nocacheflush=1, the Mtron SSD also > performed at around 1000 IOPS, which is still useless, because the array > performs the same IOPS without dedicated ZIL. > Looking at the X25-E (SLC) benchmarks it should be able to do about 3000 > IOPS, which would improve array performance. > > I think I'll try one of thise inexpensive battery-backed PCI RAM drives from > Gigabyte and see how much IOPS they can pull. >
I've given up on the Gigabyte card - it's basically unstable. I've tested it as a disk drive under ZFS and "another" operating system. Again - it glitches out - sometimes after only a couple of minutes if you tar up /usr (as a relative tar file), gzip it, and then untar it onto the Gigabyte "drive". I've got two of them - both using the recommended Kingston RAM. Both are unstable/flaky. I've tried removing some of the RAM to see if that makes a difference - it does not. Conclusion: Run Away from this product. Regards, -- Al Hopper Logical Approach Inc,Plano,TX a...@logical-approach.com Voice: 972.379.2133 Timezone: US CDT OpenSolaris Governing Board (OGB) Member - Apr 2005 to Mar 2007 http://www.opensolaris.org/os/community/ogb/ogb_2005-2007/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
