Date: Tue, 15 Nov 2005 17:54:16 -0500 From: Mikhail Teterin <mi+mx@aldan.algebra.com> To: hardware@freebsd.org Cc: emoore@freebsd.org Subject: very poor performance of LSILogic's SATA 150-6D (RAID5) Message-ID: <200511151754.16440.mi%2Bmx@aldan.algebra.com>
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Hello! We are observing very low performance of the 5- and 6-drive RAID5 array on the LSILogic. For formal comparision we created two logical drives -- a 5-drive RAID5 and a 1-drive RAID0. (All 6 disks are identical 200Gb Western Digital). According to iozone, the 5-drive RAID5 gets from 3 to 8 Mb/s. The 1-drive RAID0 goes from 20 to 50Mb/s. Now, the controller has no battery and thus is not allowed to cache much, but is the difference really supposed to be so great? It has 5 disks at its disposal, after all... -mi
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