RE: iSCSI Autosense

["Douglas Otis" <dotis@sanlight.net>]

Paul,

The answer is in how broadly you see Ethernet SCSI extending.  If in the
business of making incredibly big machines, then rejecting Autosense is a
nuisance.  Keeping SCSI applications unchanged is important when deployed by
companies promoting adapters.  We've all been in the trench created by a new
paradigm.

Doug

> -----Original Message-----
> From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
> Paul.A.Suhler@seagate.com
> Sent: Wednesday, August 30, 2000 3:57 PM
> To: ips@ece.cmu.edu
> Subject: RE: iSCSI Autosense
>
>
>
> I would look at the need a bit differently.
>
> How many native iSCSI devices will actually be built without autosense?
> I'd expect that any devices incapable of autosense will be legacy parallel
> SCSI target which can be hidden behind a bridge, as happened with Fibre
> Channel.  That can handle the functionality.
>
> Doug, you know your market better than I do.  Are there people who want to
> slap on an Ethernet/iSCSI front end without revising their task manager?
>
> Cheers,
>
> Paul Suhler
>
> Seagate Removable Storage Solutions
>
>
>
>
>
> "Douglas Otis" <dotis@sanlight.net>@ece.cmu.edu on 08/30/2000 15:30:50
>
> Sent by:  owner-ips@ece.cmu.edu
>
>
> To:   <ENDL_TX@computer.org>
> cc:   <ips@ece.cmu.edu>
>
> Subject:  RE: iSCSI Autosense
>
>
> Ralph,
>
> Perhaps I should say Mr. SCSI as I would not wish to slander obvious
> knowledge even if I may disagree. I agree ACA provides desired interlocks
> and Autosense is also highly desired. I was not concerned about
> disk drives
> as these products are easily found supporting these standards and
> represent
> no change to existing software.  Although your emulation description
> approximates ACA with CA devices, it is not as simple as not doing it at
> all
> in cases where it is not needed.  For the odd device that does run one
> command per nexus and where such use is not a horrific bottleneck and the
> removal of Autosense leaves the operation of the device unchanged, why not
> refuse Autosense?  Loaders, tape and every other odd widget you
> can imagine
> may fall into that CA category.  Mucking with ACA emulation seems wrong in
> these cases where this fig leaf is enough.  By creating an Autosense
> refusal, at least those such as yourself wishing to have a pure
> environment
> can enforce such desires.
>
> Doug
>
>