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    RE: Logical Block address in iSCSI CDB



    > My doubt is....  Do the logical block address contained in 
    > SCSI CDB inside ISCSI PDUs are actual address of the remote disk.
    > Can we change that ????
    
    Yes and no in that order.
     
    > What I am trying to do is,.......
    > 
    >   If SCSI sends only 2 block or 3 blocks, wait and collect data upto 16 
    > blocks (Usual max PDU of ISCSI) and send them over the network so that it 
    > will reduce the header over-head.
    
    That sort of thing is usually called a proxy.  Proxies can do anything
    they want, but have to take full responsibility for the results (e.g.,
    if multiple SCSI operations have been combined into a single
    iSCSI operation, when the iSCSI response comes back, it has to
    be split into the individual responses that SCSI expects to
    its individual operations.  iSCSI (like SCSI) generally does
    not support scatter-gather over the wire - the blocks in an
    individual read or write operation generally have to be contiguous.
    
    Thanks,
    --David
    ---------------------------------------------------
    David L. Black, Senior Technologist
    EMC Corporation, 42 South St., Hopkinton, MA  01748
    +1 (508) 249-6449            FAX: +1 (508) 497-8018
    black_david@emc.com       Mobile: +1 (978) 394-7754
    ---------------------------------------------------
    


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Last updated: Tue Sep 03 18:18:59 2002
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