Re: LUN field in iSCSI Data PDU

["Venkat Rangan" <venkat@rhapsodynetworks.com>]

Julo,

> The LUN field is mandated only if the Target Tag is valid (i.e., the data
> is sent in response to a R2T).
> This way you can get to "decentralize" the target activity as the tags can
> be issued "locally" by the LUs.

This doesn't seem to be of significant value. If one were to implement such
decentralization, one could use certain bits of Target Tag to identify the
decentralized entity and other bits of TTT to indicate an index within that
entity. As a target, I presume I have complete flexibility in how I choose
to allocate TTTs.

Keeping the LUN only for WRITE makes iSCSI READ and WRITE symmetric, and
opens up
the possiblity of a mismatch between the LUN in WRITE and the one in CMD.

Venkat Rangan
Rhapsody Networks Inc.
www.rhapsodynetworks.com