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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iscsi : default iscsi mode page settings - Consensus callIs the disconnect reconnect page usually initiator specific? Julo Santosh Rao <santoshr@cup. To: Julian Satran/Haifa/IBM@IBMIL hp.com> cc: ips@ece.cmu.edu Sent by: Subject: Re: iscsi : default iscsi mode page santoshr@cup.h settings - Consensus call p.com 27-09-01 18:35 Please respond to Santosh Rao Julian, As we've discussed earlier, SCSI level software looking at transport specific mode pages MUST be aware of the format of those mode pages for the given transport. (For example : The format of the disconnect-reconnect mode page is different for SPI-4, FCP-2, SRP & iSCSI). Thus, any SCSI level software needs to first be upgraded when new SCSI transports come along, before it can understand the mode page formats of that transport. By declaring the iscsi mode page fields as reserved, you would not be breaking any legacy software. There is no legacy issue here. Regards, Santosh Julian Satran wrote: > > Santosh, > > You ignore the fact that there might be SCSI level software that may want > those values. > > Julo > > > Santosh Rao > <santoshr@cup. To: "'Black_David@emc.com'" <Black_David@emc.com>, > hp.com> ips@ece.cmu.edu > Sent by: cc: > owner-ips@ece. Subject: Re: iscsi : default iscsi mode page > cmu.edu settings - Consensus call > > > 27-09-01 04:02 > Please respond > to Santosh Rao > > > > David, > > By specifying that these values be read-only in mode pages, we have > retained some of the complexity that lies in having to go across layers > to communicate the defaults to the scsi layer, or alternatively to have > the target's iscsi layer snoop for such mode sense commands and respond > to them. > > I would prefer to see iscsi declare these fields as reserved in the > iscsi definition of the mode pages [like is done in SPI-4 for > FirstBurstSize] so that this issue does not arise at all. > > Thanks, > Santosh > > > > If some aspect of the > > > SCSI protocol requires that they be readable via a mode page, > > > the mode page values will be read-only. > > #### santoshr.vcf has been removed from this note on September 27 2001 by > Julian Satran -- ################################## Santosh Rao Software Design Engineer, HP-UX iSCSI Driver Team, Hewlett Packard, Cupertino. email : santoshr@cup.hp.com Phone : 408-447-3751 ##################################
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