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    RE: Timeout values for SCSI requests



    
    
    Usually timeouts are set and enforced by the (class) driver at initiator.
    
    Julo
    
    "Lakshmi Ramasubramanian" <nramas@windows.microsoft.com> on 28-06-2001
    21:13:13
    
    Please respond to "Lakshmi Ramasubramanian" <nramas@windows.microsoft.com>
    
    To:   Julian Satran/Haifa/IBM@IBMIL
    cc:
    Subject:  RE: Timeout values for SCSI requests
    
    
    
    
    Julian,
    
    I agree transport timeouts should be fixed based on round trip delays,
    etc.
    
    But I was refering to the timeout value to be set by the target driver
    when
    it sends the scsi command to the device - I mean, the timer starts
    ticking
    after the scsi layer on the target has sent the command to the device.
    As you
    know this'd depend on the device type, command, etc.
    
    Thanks!
     -lakshmi
    
    -----Original Message-----
    From: julian_satran@il.ibm.com [mailto:julian_satran@il.ibm.com]
    Sent: Thursday, June 28, 2001 6:06 AM
    To: Lakshmi Ramasubramanian
    Subject: Re: Timeout values for SCSI requests
    
    
    
    
    Lakshmi,
    
    It was felt that execution timeouts are beyond the scope of iSCSI and
    transport timeouts should be determined dynamically based on the
    measured round trip delays.
    
    
    Julo
    
    "Lakshmi Ramasubramanian" <nramas@windows.microsoft.com> on 27-06-2001
    20:32:05
    
    Please respond to "Lakshmi Ramasubramanian"
    <nramas@windows.microsoft.com>
    
    To:   Julian Satran/Haifa/IBM@IBMIL, ips@ece.cmu.edu
    cc:
    Subject:  Timeout values for SCSI requests
    
    
    
    
    iSCSI structures for SCSI commands do not have fields to indicate
    timeout values for various commands. Only CDBs can be sent across. Do we
    expect the target driver to determine the required timeout value based
    on the CDB Opcode? Or, is there a way for the initiator to explicitly
    indicate the timeout values?
    
    Thanks!
     -lakshmi
    
    
    
    
    
    
    


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Last updated: Tue Sep 04 01:04:22 2001
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