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    Re: iSCSI:Request/Response Ordering



    
    Sanjeev,
    This is the purpose of Reserves.  Also, any application that performs this
    type of operation to the very same device, from different systems, and has
    not performed locking at the application level deserves what it gets.  If
    the connections are from the same system, this is one of the purposes of
    the Wedge Driver to coordinate I/O across different Connections.
    
    Clustered Systems have had to deal with this for the last 35 years.  Shared
    File Systems have a locking technique that spans the Cluster.  In Databases
    they also have a locking technique that spans the Cluster.
    
    .
    .
    .
    John L. Hufferd
    Senior Technical Staff Member (STSM)
    IBM/SSG San Jose Ca
    Main Office (408) 256-0403, Tie: 276-0403,  eFax: (408) 904-4688
    Home Office (408) 997-6136
    Internet address: hufferd@us.ibm.com
    
    
    "Sanjeev Bhagat \(TRIPACE/Zoetermeer\)" <iscsi_t10@sanjeevbhagat.com>
    @ece.cmu.edu on 09/29/2001 06:00:10 PM
    
    Sent by:  owner-ips@ece.cmu.edu
    
    
    To:   "'IPS Reflector'" <ips@ece.cmu.edu>, <T10@t10.org>
    cc:
    Subject:  iSCSI:Request/Response Ordering
    
    
    
    
    Hello All (T10, IPS),
    
    The SAM-2 specifications makes no assumption about,  or places any
    requirement on the ordering of requests or responses between tasks  or task
    management functions received from different SCSI initiator  ports.
    
    In this scenario how can a SCSI target make  correctly handle the
    read/write requests made on same blocks by different  intiators at the same
    time.
    
    Sanjeev
    
    
    
    
    
    
    


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