Date: Wed, 5 Sep 2001 09:26:07 +0100 From: "Lawrence Farr" <l.farr@epcdirect.co.uk> To: "'Greg Lehey'" <grog@FreeBSD.org>, "'Lawrence Farr'" <lawrence@epcdirect.co.uk> Cc: "'David Gilbert'" <dgilbert@velocet.ca>, "'Chris BeHanna'" <behanna@zbzoom.net>, "'FreeBSD-Stable'" <stable@FreeBSD.org> Subject: RE: [stable] Re: RAID5 Message-ID: <002c01c135e4$69c924d0$c80aa8c0@lfarr> In-Reply-To: <20010905085301.K85816@wantadilla.lemis.com>
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I did these tests in response to a recent thread on hardware (look for "3ware stuff not ready for heavy duty useage"). I had the hardware ready to build when the whole thing came up, and offered to thrash it in an effort to break it. OK, what I did was write a small shell script that took a 1Mb dump of /dev/urandom And wrote it to disk till it made a ~1Gb file. Then divided seconds elapsed by filesize To get a rough average of speed. Then read the file and averaged the read speed. I did this Until I had filled the partition (140 passes), then did the whole thing again for a day or so. >-----Original Message----- >From: Greg Lehey [mailto:grog@FreeBSD.org] >Sent: 05 September 2001 00:23 >To: Lawrence Farr >Cc: David Gilbert; Chris BeHanna; FreeBSD-Stable >Subject: Re: [stable] Re: RAID5 > > >On Tuesday, 4 September 2001 at 13:52:02 +0100, Lawrence Farr wrote: >> Just to add another benchmark, I got: >> >> Pass 23 - 1048576 kb written in 115 seconds, at 9118 kb/Sec >> Pass 23 - 1048576 kb read in 15 seconds, at 69905 kb/Sec > >This shows there's a big difference. Which is which? What is it >really doing here? > >Greg >-- >See complete headers for address and phone numbers > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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