iSCSI: NopIn in ping mode can contain data?

[Tow Wang <Tow_Wang@adaptec.com>]

Hello everybody.

1) When a target sends out a NopIn as a ping, is it allowed to contain a
data segment?
2) If yes,
    a) why would anyone send data along?
    b) must the initiator echo back the data?

I haven't found a clear answer in draft 9. Thanks for any
clarifications.
--
Tow Wang
Adaptec Software Engineer