Date: Tue, 3 Jan 1995 14:26:05 +1100 From: Bruce Evans <bde@zeta.org.au> To: hackers@freebsd.org, terry@uivlsi.csl.uiuc.edu Subject: Re: Emulex MD21 question Message-ID: <199501030326.OAA25453@godzilla.zeta.org.au>
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> By any chance is anyone here familiar with the Emulex MD21 ESDI->SCSI >bridge? I'm trying to use one with a 10MHz ESDI drive and a 15MHz ESDI drive. >It does work, but the transfer rate to the 15MHz drive is only about 650KB/s. >I measured the transfer rate by both dd and CORETEST (DOS benchmark). It is >as if the MD21 formats 15MHz drives with a 2:1 interleave. Is this >a limitation of the MD21? Thanks for your time. Some controllers can't keep up with 15MHz unless the drive is formatted with 2:1 interleave. I had this problem with a WD1007V-SE/1 controller. I enjoyed trashing my 10MHz and 15MHz ESDI drives (original cost US$2250) and replacing them with a US$300 IDE drive to get twice the performance. Bruce
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