RAID using SCSI 2 and SCSI3

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Previously Richard <r_moorhouse@hotmail.com> wrote:
> Hi

> Would someone be able to clarify something for me.

> I have inherited a machine which has four SCSI disks, at the moment
> they are one logical device and RAID 0. The top disk keeps taking
> itself offline. Examining the disks more closely, two are SCSI2 and
> two are SCSI3 disks. Is it possible to combine these types of disk in
> a single RAID setup? Or will it cause the problems I am getting with
> this machine?

Would be surprisiong. Usually you can mix any combination of SCSI
disks. Have you looked into the error log of the disk to find
out why it takes itself offline?

> As I understand it it would work if say the SCSI3 disks were on one
> RAID, and teh SCSI2 were on another RAID?

Should not make a difference unless the firmware is buggy. That
is a possibility, but an unlikely one. The disk more likely has some
other problem or the termination is bad and it gets so many
errors on the bus that it decides the bus is unusable.

Arno
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