Date: Fri, 29 Apr 2005 07:09:28 +0300 From: Petri Helenius <pete@he.iki.fi> To: Eric Anderson <anderson@centtech.com> Cc: Peter Losher <Peter_Losher@isc.org> Subject: Re: Very low disk performance Highpoint 1820a Message-ID: <4271B378.5050100@he.iki.fi> In-Reply-To: <4271ADA0.2070000@centtech.com> References: <06ba01c54bff$8c5aed00$7f06000a@int.mediasurface.com> <4271812F.4060808@isc.org> <4271ADA0.2070000@centtech.com>
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Eric Anderson wrote: > > I'm using fiber channel SATA, and I get 2x write as I do read, which > doesn't make sense to me. What kind of write speeds do you get? My > tiny brain tells me that reads should be faster than writes with a RAID5. > I'm seeing similar sequential performance on RELENG_5_3 and RELENG_5_4 on dual-Xeons using 3ware controllers so it does not seem to be a driver issue but somewhere else in the architechture. Depending on the array configuration, 40-60MB/s reads and 100-160MB/s writes. The write performance is as expected but the read performance should be above the write performance. Pete
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