Date: Sun, 09 Mar 1997 15:41:12 -0800 From: David Greenman <dg@root.com> To: Keith Mitchell <kmitch@weenix.guru.org> Cc: scsi@freebsd.org Subject: Re: Micropolis 4221W and 20MB/s SYNC Message-ID: <199703092341.PAA14163@root.com> In-Reply-To: Your message of "Sun, 09 Mar 1997 09:29:07 EST." <199703091429.JAA00689@weenix.guru.org>
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>For some reason my Micropolis 4221W (wide scsi) drive is only getting >10 MB/s sync rate instead of the 20 it is supposed to get (according to >the drive spec). The drive is hanging off an Adaptec 3940UW controller. > >The sync rate in the setup is set to 20 and ultra is disabled (enabling it >doesn't do anything). Ultra mode has to be enabled in SCSI-select in order to use Ultra speeds. The problem is that the Micropolis 4221 isn't an Ultra-SCSI drive. The product literature clearly says "fast/wide" which means 10MHz, 16bits...or in other words, 20MBytes/sec. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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