Date: Tue, 02 Oct 2001 23:31:29 +0100 From: Pete French <pfrench@firstcallgroup.co.uk> To: freebsd-stable@freebsd.org Subject: dirpref speedup with Compaq RAID controller Message-ID: <E15oY4X-000LXM-00@mailhost.firstcallgroup.co.uk>
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As someone requested timings from RAID systems for old/new dirpref code: System has as the main disc (i.e. boot, /, /usr etc) as pair of SCSI UW drives connected to a Compaq SMART-2SL controller. Configuration is RAID 0, and I think the stripe size is 64k or so - whatever the conttroller thinks is suitable for UNIX anyway. I recreated my /usr/src tree using tar/untar into a directory next to it so I could compare operations. The disc has softupdates enabled on it. Doing a 'du -s' is 2.1 times faster on the new tree. Doing an 'rm -r' is 2.9 times faster on the new tree. Subjecyively the two tree sound very different in tersm of drive noise - as the two discs are mounted differently in the case they sound different. You can hear that operations on the old tree appear to be evenly mixed across both discs. Operations on the new tree very obviously alternate discs as the proceed. There seems to be far less disc activity when operating on the new tree too, as you might expect. -pete. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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