On Wed, June 16, 2010 10:44, Arne Jansen wrote: > David Magda wrote: > >> I'm not sure you'd get the same latency and IOps with disk that you can >> with a good SSD: >> >> http://blogs.sun.com/brendan/entry/slog_screenshots [...] > Please keep in mind I'm talking about a usage as ZIL, not as L2ARC or main > pool. Because ZIL issues nearly sequential writes, due to the > NVRAM-protection > of the RAID-controller the disk can leave the write cache enabled. This > means > the disk can write essentially with full speed, meaning 150MB/s for a 15k > drive. > 114000 4k writes/s are 456MB/s, so 3 spindles should do.
Yes, I understood it as suck, and that link is for ZIL. For L2ARC SSD numbers see: http://blogs.sun.com/brendan/entry/l2arc_screenshots _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
