Date: Sun, 05 Feb 2006 11:41:22 +0100 From: Ivan Voras <ivoras@fer.hr> To: "Marc G. Fournier" <scrappy@hub.org> Cc: stable@freebsd.org, freebsd-proliant@freebsd.org Subject: Re: Compaq Proliant CISS slow writes Message-ID: <43E5D652.6010205@fer.hr> In-Reply-To: <20060204213028.D3207@ganymede.hub.org> References: <43E52A89.4020700@fer.hr> <20060204213028.D3207@ganymede.hub.org>
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Marc G. Fournier wrote: > > Not sure if this is standard, but on an idle machine (ie. just set it > up, nothing running on it yet), with RAID1+0 across 4 drives: > > Writing the 853 Megabyte file, 'iozone.tmp'...15.656250 seconds > Reading the file...3.921875 seconds > > IOZONE performance measurements: > 57129601 bytes/second for writing the file > 228063191 bytes/second for reading the file I could live with 4x slower writes - that would get me ~18MB/s; I'd settle for ~10MB/s as the server is on a 100Mbit/s network. If it's the standard situation then ok, it's "higher power" but somehow I doubt 3 10kRPM SCSI drives in RAID5 should be this slow. Toying with mount options doesn't help. (btw. everything is fine on the attached desktop-grade IDE disk [very recent model]: 45MB/s writes, 50MB/s reads)
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