Date: Mon, 31 Oct 2011 13:41:30 -0800 (PST) From: Keith <kwoody@citytel.net> To: freebsd-questions@freebsd.org Subject: RAID5 speed question. Message-ID: <20111031132920.A86972@pop.citytel.net>
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Have an ancient 4.1R mail server to replace. It has about 3000 accounts. Usual /var/mail to store mail. /var/mail is RAID5 on an old Dell PERC3 card. Its worked pretty well and have lived through 3 drive failures over the years. New Dell box with a PERC5/i. Same drive setup, a 500GB RAID5 for /var/mail. I do an ls -l in /var/mail on the old 4.10 machine and I get a directory listing in about 2 seconds. This is about 3000 mailboxes. On the new machine running 7.3 with the PERC5/i I rsync'd /var/mail and do an ls -l and it takes a full 22 seconds to get a directory listing. A plain ls in /var/mail on both machines is instantaneous. I know RAID5 is not 'optimal' for this but I'm surprised at the difference in how long it takes to do a directory listing using ls -l on the new machine compared to the old one. The new array is 500GB compared to about 36GB on the older machine. Shouldn't a long directory listing be faster on the PERC5/i compared to the old PERC3? Other than that the new machine in all other aspects is faster, a lot faster. Thanks.
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