|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: iscsi : changes involving tgt portal group tag.In SCSI (and I presume in iSCSI), there is no requirement that the logical unit number to logical unit mapping be the same as seen by all ports. In other words, it is a Port||LUN combination that identifies a logical unit, not a LUN alone. The mappings can be determined by a number of discovery mechanisms and verified by use of the logical units world-wide name identifier from the INQUIRY VPD page. I don't think this has much effect on the rest of the ongoing discussion, but if it does, please keep it in mind. > Part of the concern appears to be around the worry that an initiator > might reconnect to "the wrong" port and as a result end up talking to > the wrong LU when it issues additional commands to a LUN it knows. > > I don't understand how that's possible. SAM-2 section 4.7.3 shows > that an LU is a component of a Device (not of a Port). And 4.8 says > that a LUN "identifies the logical unit within a SCSI target device". > > In other words, no matter what port you use to access a device, a > given LUN identifies the same LU in that device. >
Home Last updated: Fri Mar 15 03:18:29 2002 9131 messages in chronological order |