Long Identifiers and third parties: 00-425r0

Jim Hafner hafner at almaden.ibm.com
Thu Dec 21 10:46:54 PST 2000

* From the T10 Reflector (t10 at t10.org), posted by:
* "Jim Hafner" <hafner at almaden.ibm.com>

John Lohmeyer has kindly posted the following document "Long Identifiers in
SPC-3, SAM-2, SBC-2 and other XOR issues", doc number 00-425r0 on the t10
web site:   ftp://ftp.t10.org/t10/document.00/00-425r0.pdf

This attempts to address issues raised by Ed Gardner (00-279r0) on long
(more than 64bits) SCSI device identifiers as needed for iSCSI and SRP and
issues raised by Rob Elliot (00-248r2) concerning third party identifiers
in some XOR commands.

In summary, the idea is to have the logical unit (device server) maintain a
volatile list of "aliases" that map to longer identifiers.  Aliases are
short enough to fit in a new target descriptor for EXTENDED COPY and the
"longer identifiers" can be specified in an extensible and/or
protocol-specific formats.  Changes are proposed to the XOR model to allow
these types of command to use of EXTENDED COPY target descriptors.  This
unifies the third-party addressing issues under one model description.

The list of aliases is managed with two new service actions in the
MAINTENANCE IN/OUT pair. One changes the alias list, the other reports the

See the document for the details.

Jim Hafner

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