Date: Sun, 9 Mar 1997 18:10:16 +0200 (SAT) From: John Hay <jhay@zibbi.mikom.csir.co.za> To: kmitch@weenix.guru.org (Keith Mitchell) Cc: scsi@freebsd.org Subject: Re: Micropolis 4221W and 20MB/s SYNC Message-ID: <199703091610.SAA25371@zibbi.mikom.csir.co.za> In-Reply-To: <199703091429.JAA00689@weenix.guru.org> from Keith Mitchell at "Mar 9, 97 09:29:07 am"
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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. > Are you sure? The way I read it, is 16Bit (2 bytes) and 10MHz which gives 20MB/s. John -- John Hay -- John.Hay@mikom.csir.co.za
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