Re: Question on SCSI target scan

[James Bottomley <jbottomley@parallels.com>]

On Mon, 2013-11-18 at 00:52 -0700, Ramesh Chikkanayakanahally wrote:
> Thanks for the response. 
> 
> If using RSCN sounds like a reasonable approach in this scenario
> (protocol limitations),  then as per the original question  - would it
> be acceptable to add an interface in scsi_transport_fc layer, which
> can be invoked on receiving RSCN to trigger SCSI target re-scan
> (REPORT LUNS) ?

No, but what you want to do is send a TEST UNIT READY to one of the
target LUNs ... you can trigger that from the FC transport class, I
think.  That should return a CHECK CONDITION/UNIT ATTENTION which will
trigger the collection of sense and the new uevent mechanism for doing a
rescan.  This hooks it into the standard AEN UNIT ATTENTION handling
rather than having this all done per-transport.  The only per-transport
thing we need is to trigger collection of the UA on the transport
specific AEN.

James