What is your NFS window size? 32kb * 120 * 7 should get you 25MB/s. Have considered getting a Intel X25-E? Going from 840 sync nfs iops to 3-5k+ iops is not overkill for SSD slog device. In fact probably cheaper to have one or two less vdevs and a single slog device.
Nicholas On Tue, Jul 7, 2009 at 10:14 PM, erik.ableson <eable...@mac.com> wrote: > > Configuration: PE2950 bi pro Xeon, 32Gb RAM with an MD1000 using a zpool of > 7 mirror vdevs. ESX 3.5 and 4.0. Pretty much a vanilla install across the > board, no additional software other than the Adaptec StorMan to manage the > disks. ... > Now I can understand that there is a performance hit associated with this > feature of ZFS for ensuring data integrity, but this drastic a difference > makes no sense whatsoever. The pool is capable of handling natively (at > worst) 120*7 IOPS and I'm not even seeing enough to saturate a USB thumb > drive. This still doesn't answer why the read performance is so bad either. > According to latencytop, the culprit would be genunix`cv_timedwait_sig > rpcmod`svc >
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
