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Date:      Fri, 13 Jul 2001 23:59:19 -0700 (PDT)
From:      Lamont Granquist <lamont@scriptkiddie.org>
To:        Bruce Burden <brucegb@realtime.net>
Cc:        <freebsd-stable@freebsd.org>
Subject:   Re: Regarding New FreeBSD BenchMark From Sysadmin Mag (left out a fiew tuning options)
Message-ID:  <20010713235530.W12542-100000@coredump.scriptkiddie.org>
In-Reply-To: <20010713211922.A8312@tigerfish2.my.domain>

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On Fri, 13 Jul 2001, Bruce Burden wrote:
> > 			Some SCSI drive manufacturers ship their drives
> > with WCE enabled.  Other SCSI drive manufacturers, who are more
> > concerned with data integrity as opposed to performance figures, will
> > ship their drives with WCE disabled.
> >
> 	I have 3 IBM drives, and the /root drives (U160's) are WCE
>     enabled. The non-root drive (also happens to be U2W), does not
>     have WCE enabled.
>
> 	Could WCE be a featue of U160?

i've got:

ahc0: <Adaptec 3960D Ultra160 SCSI adapter> port 0xcc00-0xccff mem 0xefffe000-0xefffefff irq 11 at device 13.0 on pci0
aic7899: Wide Channel A, SCSI Id=7, 32/255 SCBs
ahc1: <Adaptec 3960D Ultra160 SCSI adapter> port 0xdc00-0xdcff mem 0xeffff000-0xefffffff irq 10 at device 13.1 on pci0
aic7899: Wide Channel B, SCSI Id=7, 32/255 SCBs

and:

da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST336704LW 0004> Fixed Direct Access SCSI-3 device
da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), Tagged Queueing Enabled
da0: 35003MB (71687369 512 byte sectors: 255H 63S/T 4462C)

and WCE was = 1 by default, but camcontrol worked to turn it off


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