Date: Mon, 25 Jun 2001 15:55:18 -0700 From: Flemming Froekjaer <flemming@froekjaer.org> To: hardware@freebsd.org Subject: Disk performance Message-ID: <3B37C156.CD4CE20C@froekjaer.org>
next in thread | raw e-mail | index | archive | help
I tried to dump a file system to a DLT tape. The tape is cable of 10MB/s but I only got about 1600 KB/s To find out if it was the tape I tried to dump to /dev/null instead, but i still only get 1665 KB/s It's a raid 1 on a ami raid controller, and 2 IBM Disks. What performance should I expect from a setup like that? How do I best measure the disk performance? I get about twice that performance from my IDE workstation. That cant be right. Is there any way to improve the performance? \Flemming > dump -0af /dev/null / DUMP: Date of this level 0 dump: Mon Jun 25 10:41:35 2001 DUMP: Date of last level 0 dump: the epoch DUMP: Dumping /dev/amrd0s1a (/) to /dev/null DUMP: mapping (Pass I) [regular files] DUMP: mapping (Pass II) [directories] DUMP: estimated 34970 tape blocks. DUMP: dumping (Pass III) [directories] DUMP: dumping (Pass IV) [regular files] DUMP: DUMP: 34972 tape blocks on 1 volume DUMP: finished in 21 seconds, throughput 1665 KBytes/sec DUMP: Closing /dev/null DUMP: DUMP IS DONE > mount /dev/amrd0s1a on / (ufs, local) /dev/amrd0s1f on /usr (ufs, NFS exported, local, soft-updates) /dev/amrd0s1e on /var (ufs, local, soft-updates) procfs on /proc (procfs, local) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3B37C156.CD4CE20C>