On Thu, Jul 30, 2009 at 14:50, Kurt Olsen<no-re...@opensolaris.org> wrote: > I'm using an Acard ANS-9010B (configured with 12 GB battery backed ECC RAM w/ > 16 GB CF card for longer term power losses. Device cost $250, RAM cost about > $120, and the CF around $100.) It just shows up as a SATA drive. Works fine > attached to an LSI 1068E. Since -- as I understand it -- one's ZIL doesn't > need to be particularly large, I've split that into 2 GB of ZIL and 10 GB of > L2ARC. Simple tests show it can do around 3200 sync 4k writes/sec over NFS > into a RAID-Z pool of five western digital 1 TB caviar green drives.
I, too, have one of these, and am mostly happy with it. The biggest inconvenience about it is the form factor: it occupies a 5.25" bay. Since my case has no 5.25" bays (Norco RPC-4220) I improvised by drilling a pair of correctly spaced holes into the lid of the case and screwing it in there. This isn't really recommended for enterprise use, where drilling holes in the equipment is discouraged. I don't have benchmarks for my setup, but anecdotally I no longer see the stalls accessing files over NFS that I had before adding the Acard to my pool as a log device. I only have 1GB in it, and that seems plenty for the purpose: it only ever seems to show up as 8k used, even with 100 MB/s or more of writes to it. Also, I should point out that the device doesn't support SMART. Some raid controllers may be unhappy about this. Will _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
