SCSI devices under A/UX
walt dixon
dixon at sagittarius.crd.ge.com
Tue Mar 13 23:55:50 AEST 1990
In response to a question about what devices the A/UX SCSI driver will
support, William Roberts write:
>Disk drives are OK, but they will need to be partitioned in a
>way that conforms to the Apple partitioning approach, and then
>some extra A/UX stuff done with the A/UX dp utility. Your best
>bet is to stick with a disk that is advertised as being
>suitable for use with the Macintosh (but then these are pretty
>cheap anyway, compared with Sun peripherals and the like).
>
>Any Mac-compatible disk that doesn't require special things in the
>System Folder should work, and so do some of the ones that do. The
>SCSI handling under A/UX is more or less generic SCSI commands
>and the A/UX system understands big disks just like other UNIX
>systems do.
A word of caution is in order here. If one is using the drive solely
for A/UX, the generic SCSI driver works fine, but one may run into
problems with a MacOS partition. Before Jasmine came out with support
for A/UX (they do support A/UX now, don't they?), I moved A/UX to
a Jasmine DD140 drive (creating a 40MB mac partition and increasing the
size of the root A/UX file system. Using the generic SCSI driver
A/UX worked flawlessly, but the MacOS hung during disk writes. After
some digging, I traced the probem to SCSI write blind commands.
By converting write blind requests to write, I eliminated the MacOS
write problem.
Walt Dixon {arpa: dixon at crd.ge.com }
{us mail: ge crd }
{ po box 8 }
{ schenectady, ny 12301 }
{phone: 518-387-5798 }
Walt Dixon dixon at crd.ge.com
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