Date: Sun, 9 Mar 1997 09:29:07 -0500 (EST) From: Keith Mitchell <kmitch@weenix.guru.org> To: scsi@freebsd.org Subject: Micropolis 4221W and 20MB/s SYNC Message-ID: <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). I am running 2.2-GAMMA from 3/05. Below is the verbose probe message for the drive. ahc0: target 0 using 16Bit transfers ahc0: target 0 synchronous at 10.0MHz, offset = 0x8 ahc0: target 0 Tagged Queuing Device (ahc0:0:0): "MICROP 4221-09 1128RF 28RF" type 0 fixed SCSI 2 sd is configured at 0 sd0(ahc0:0:0): Direct-Access 1955MB (4004219 512 byte sectors) sd0(ahc0:0:0): with 4048 cyls, 9 heads, and an average 109 sectors/track As you can see it uses wide transfers. It just is operating at hakf the speed it should.
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