Date: Mon, 25 Nov 1996 10:22:33 -0500 (EST) From: Rashid Karimov <rashid@rk.wbs.com> To: dawes@rf900.physics.usyd.edu.au (David Dawes) Cc: mrcpu@cdsnet.net, hackers@freebsd.org Subject: Re: Holy Moley Batman... I love ccd. and BTW, if you need 4gb disks. Message-ID: <199611251522.KAA10615@rk.wbs.com> In-Reply-To: <199611240542.QAA16133@rf900.physics.usyd.edu.au> from "David Dawes" at Nov 24, 96 04:42:07 pm
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I had read/write at about 18+ Mb/sec ( didn't use IOZONE though - was doing dd on huge files - 300+ MB, back and forth between /dev/ull , /dev/zero and CCD based 25GB partition. Total of 3 wide AHAs and 6 Seagate Barracudas were used at 200 Mhz PPRo MB by ASUS. That was quite a box ( was used for USENET news ). Sounded like a subway train all the time ( 6 HDs !), was very stable and fast. As far as I remember I had 256 in the ccd.conf file - it gave about even read and write speeds. > > >Just playing around with CCD and 2 Atlas's on a P120 2940UW, 128MB RAM. > > > >It kept the sys time at 80-90%, so maybe a faster CPU would help. > > > > > > > > IOZONE writes a 512 Megabyte sequential file consisting of > > 8192 records which are each 65536 bytes in length. > > It then reads the file. It prints the bytes-per-second > > rate at which the computer can read and write files. > > > > > >Writing the 512 Megabyte file, 'iozone.tmp'...42.148438 seconds > >Reading the file...37.859375 seconds > > > >IOZONE performance measurements: > > 12737623 bytes/second for writing the file > > 14180659 bytes/second for reading the file (It was over 15 on one > >run). > > What ccd parameters are you using? > > David >
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