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    Re: Towards Consensus on TCP connections



    Jeff,
    
    You missed a few:
    
      > SPI-4 ftp://ftp.t10.org/t10/drafts/spi4/spi4r00.pdf
      > FCP-2 ftp://ftp.t10.org/t10/drafts/fcp2/fcp2r04.pdf
      > SVP   ftp://ftp.t10.org/t10/drafts/svp/svp-r01.pdf
      > SBP-2 ftp://ftp.t10.org/t10/drafts/sbp2/sbp2r04.pdf
    
    Every one of these is newer and represents more current thinking
    on packetized SCSI protocols than GPP.
    
    I'd be the first to admit that SPI-4 is easy to miss as a key
    SCSI packetized protocol document, sorting your way through its
    328 pages is no small feat.  Still, clause 14 (pdf pages 170-183)
    defines a packetized protocol for the parallel SCSI bus and the
    packet formats on pdf pages 175-183 are an important part of the
    current packetized work.
    
    It is also very important to note that SPI-4, FCP-2, and SVP are
    active projects that share a goal of common packet formats to
    simplify implementation of bridges between the parallel bus,
    fibre channel, and VI.  While I don't wish to dogmatically cling
    to this goal for IP SCSI, it definitely is worthy of consideration.
    A particular issue in this regard is maintaining the LUN field
    in each packet.
    
    Thanks.
    
    Ralph Weber
    SAM-2 & SPC-2 Technical Editor
    
    
    Jeff Fellin wrote:
    
    > Folks,
    > After reading all the discussion and debate on this issue, I decided to
    > research if the SCSI standards (T10/X3) have done with developing other
    > transport protocols, and how those protocols dealt with connectivity
    > issues between the endpoints. For the most part the other transport
    > protocols SCSI over Scheduled Transport (SST), which is a working draft
    > and the SCSI-3 Generic Packetized Prococol (SCSI-GPP), which is a proposed
    > technical report have a concept of a Logical or Virtual connection. This
    > Logical or Virtual connection has at least one connection through the
    > network, but may have more up to endpoint configuration parameters. So,
    > it appears the other groups have not come to a consensus as to the approach.
    >
    > Most of the drafts are available on the T10's web site:
    >         www.t10.org
    >
    > Except for the definition of the Scheduled transfer protocol, which is on
    > T11's web site:
    >         www.t11.org
    >
    > The most interesting thing I came up with is the SCSI-GPP definition is
    > written to allow connections over IP networks. Annexes E and F describe
    > the mapping and processing capabilities. If this is a work in progress
    > should we take advantage of there previous start and work with T10 to
    > have a better definition of a protocol for storage over IP?
    >
    > What I understand from a quick read of the SST and SCSI-GPP protocol
    > definitions is they have dealt with the issues of security, error recovery,
    > connection management, transfer of SCSI bus control signals (bus reset,
    > abort tasks.
    >
    > If we don't use the SCSI-GPP than I propose changing the one LUN per
    > TCP connection group to be a SCSI target id that multiplexes all LUN's
    > of the target id onto the connection group. I believe this will decrease
    > the amount of connections and provide data channels for large transfers.
    >
    > Sincerely,
    >         Jeff Fellin
    >         MH 2A-352
    >         (908) 582-7673
    >         fellin@lucent.com
    
    
    


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Last updated: Tue Sep 04 01:07:50 2001
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