Andrey Kuzmin wrote: > As to X25-E (released today), this indeed would be a worthwhile try as > both ZIL and L2ARC device (I believe the latter, if not both, has > already been explored at Sun).
Update to my saga: I'm thoroughly disappointed with Mtron 3035 drives, but maybe they are just not suited for server use at all. The random write performance is worse than a mechanical drive! At this point, we're looking to put ZIL on an NVRAM-based device, the Gigabyte I-RAM with 4GB of memory (its max.) http://www.gigabyte.com.tw/Products/Storage/Products_Overview.aspx?ProductID=2180 In advance of getting that, I did a rough approximation of its performance by creating a 4GB file in /tmp and lofi-mounting it. I turned off swap to ensure the file didn't ever get swapped out of main memory (I have 32GB in this box, so it's not an issue, and it's a test system anyway.) # zpool destroy data # swap -d /dev/zvol/dsk/rpool/swap # mkfile 4g /tmp/slogfile # lofiadm -a /tmp/slogfile # zpool create data raidz \ c0t2d0 c0t3d0 c0t4d0 c0t5d0 c0t6d0 c0t7d0 log /dev/lofi/1 Of course, I can't reboot or crash without losing my ZIL, but this is a test box, and I'd never run it this way in production. Nevertheless, performance is impressive, as we expect: extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 6148.2 0.0 786974.6 26.6 3.4 4.3 0.6 86 86 lofi1 >6000 write IOPS, or roughly 200x more than we were getting with the Mtrons. We'll also be evaluating the Intel X-25E as soon as we can get our grubby little hands on one. :) Eric _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
