Re: iSCSI: Notifications on error

["Julian Satran" <Julian_Satran@il.ibm.com>]

Lakshmi,

The freeze is a SCSI freeze and SCSI has also commands to thaw the queue
(look for ACA reset and equivalents for UA cases).
iSCSI does not have to be involved.

Julo




                                                                                                                                              
                      "Lakshmi                                                                                                                
                      Ramasubramanian"           To:       <ips@ece.cmu.edu>                                                                  
                      <nramas@windows.mic        cc:       "Joe Dai" <joedai@windows.microsoft.com>                                           
                      rosoft.com>                Subject:  iSCSI: Notifications on error                                                      
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                      07/25/2002 05:08 PM                                                                                                     
                                                                                                                                              
                                                                                                                                              



If a command fails at the SCSI layer (on the target side), the driver
can freeze the queue, and fail all requests till the queue is unfreezed.
The target needs to tell the initiator about the queue freeze condition
so that an initiator can issue an unfreeze request.

Currently there is no way (as much as I could understand) in the spec
to do such a thing. We can use vendor specific Async messages, but that
will cause interop problems.

Is it reasonable to request for a mechanism to do the above in the iSCSI
spec?

thanks!
 -lakshmi