On 01/28/2013 04:44 PM, Bart Van Assche wrote:
On 01/28/13 16:05, Jeremy Linton wrote:
What I think your looking for is RSCN (Registered State Change
notification).
Hook that, and then check the name server. This will tell you when
ports get
added/removed. You can then report luns against lun 0 of all the
known target
ports. This allows you to transparently detect changes.
Otherwise, you run the risk of trapping UA's in the lower level
portions of
the stack that _REALLY_ need to be propagated to the controlling
driver or
application.
Thanks for the feedback. Unfortunately sending an RSCN is only
possible when using Fibre Channel as transport layer. I'm looking
for a solution that also works with other SCSI transports, e.g.
iSCSI and SRP.
And we're already doing that. Rather, the FC HBAs do exactly this.
So the proposal would be to export a 'virtual' LUN0 if none is
present, so that we always have a device to talk to, right?
Shouldn't be too hard; we already create a 'virtual' LUN0 during
scanning, only we delete it if no LUNs are found.
So we're already doing this, only we don't tell :-)
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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