Am 09.09.2010 um 07:00 schrieb zfs-discuss-requ...@opensolaris.org: > What's the write workload like? You could try disabling the ZIL to see > if that makes a difference. If it does, the addition of an SSD-based > ZIL / slog device would most certainly help. > > Maybe you could describe the makeup of your zpool as well? > > Ray
The zpool is a mirrored root-pool (2 SATA 250GB devices). The box is a Dell PE T710. When I copy via NFS, zpool iostat reports 4MB/sec along the copy process. When I copy via scp I get a network performance of about 50 MB/sec and zpool iostat reports 105 MB/sec for a short interval about 5 seconds after scp completed. As far as I figured out, the problem is the nfs commit, that forces the filesystem to write data directly on disk instead of caching the data stream, like it is done in the scp example. NFS was there long before SSD-based drives where. I can not imagine, that NFS performance used to be not more than 1/3 of the speed of a 10BaseT connection ever before... Martin _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
