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    Peter Johansson: Re: IETF mailing list question on Storage over Ethernet/IP



    
    
    ------- Forwarded Message
    
    Date:    Fri, 26 May 2000 10:39:58 -0700
    From:    Peter Johansson <PJohansson@acm.org>
    To:      IP Storage <IPS@ece.cmu.edu>
    Subject: Re: IETF mailing list question on Storage over Ethernet/IP
    
    Some time ago, Randy_Haagens@hp.com wrote:
    
    >Just about any reliable transport will do nicely for transporting SCSI 
    >commands.
    
    Very true---which is why it's difficult to discuss these issues 
    generically. Many questions can't be answered until you look at the 
    particular needs of the particular environment.
    
    In the home network, IEEE 1394 is a strong contender, with speeds that 
    range from 400 Mbps to 1.6 Gbps. TCP does add a lot of overhead; it's 
    appropriate to consider it only when other considerations (extensibility to 
    the WAN, for example) predominate.
    
    In an environment like the home network, a "native" solution may be better.
    
    I mention all of this because I think it's worth your time to look at NCITS 
    325-1998, Serial Bus Protocol 2 (SBP-2). SBP-2 describes the encapsulation 
    of SCSI commands and a DMA architecture for the efficient transfer of data 
    over IEEE 1394.
    
    OK, you say, "So what? FCP does this. SSA did this." and so on. Well, the 
    point is that Fibre Channel is not a serious contender for use as a 
    network. In some situations, such as the home or small office, IEEE 1394 is.
    
    Regards,
    
    Peter Johansson
    
    Congruent Software, Inc.
    98 Colorado Avenue
    Berkeley, CA  94707
    
    (510) 527-3926
    (510) 527-3856 FAX
    
    PJohansson@ACM.org
    
    ------- End of Forwarded Message
    


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