> Another reason for implementing the above emulated tape, and adding
> ECKD emulation over SCSI in VM ...
Well, I don't see why we would need to run SCSI over IP for that.
z/VM is capable of doing SCSI of FC, at least disk; not sure,
though, what their status regarding SCSI tape is.
Anyway, my feeling is that each attempt to bridge two paradigms,
as done by an emulation layer, must come with its own inherent
problems that cost some of the superiority of the base
infrastructure you have mentioned.
Mit freundlichen Grüßen / with kind regards
Martin Peschke
IBM Deutschland Entwicklung GmbH
Linux for zSeries Development
Phone: +49-(0)7031-16-2349
David Boyes <[EMAIL PROTECTED]>
Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU>
05/10/2005 19:37
Please respond to Linux on 390 Port
To: LINUX-390@VM.MARIST.EDU
cc:
Subject: Re: iSCSI
Darn, hit send too soon.
> Do you suggest to use an
> iSCSI tape device attached to Linux to do backup of z/VM or z/OS data?
No, I want emulated 3420 or 3480/3490 directly on SCSI for that. You've
done
it in the P/390 and MP2k/3k, and given the generic SCSI kernel in the
later
VM revs, this shouldn't be rocket science at all to adapt the device
driver
engines in AWS3480 and AWS3420 to the generic SCSI kernel. 3420 would be
better for the large capacity tapes, as it's model of "write until I get a
EOT marker" is a better fit for a 300G AIT tape.
> As far as I know, z/OS doesn't support SCSI at all.
Another reason for implementing the above emulated tape, and adding ECKD
emulation over SCSI in VM (which you've also done in the P/390... See
above). AWSECKD should have all the code you need to add ECKD emulation to
a
generic SCSI implementation for 3380 and 3390 devices.
If those two things were available, then z/OS could remain fat, dumb and
happy and work fine in a all-SCSI environment with relatively small
amounts
of work. z/VM would "just work" (as always) and VSE could just go along
for
the ride...8-)
-- db
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