On Sep 6, 2005, at 11:43 AM, Christoph Hellwig wrote:
On Thu, Aug 11, 2005 at 06:50:03PM +0200, Harald Seipp wrote:
Christoph Hellwig wrote on 11.08.2005 18:40:03:
On Thu, Aug 11, 2005 at 05:44:46PM +0200, Harald Seipp wrote:
Thank you for your quick responses! It finally looks like the task
I need
to do - fully rescan all hosts for newly attached/changed devices -
must
include the logic to skip devices with mounted fs for 2.6.
Why do you want to rescan a full bus anyway? What SCSI transport do
you
want this for? All transports where new targets can be hot-plugged
should
be doing automatic scanning already.
Old-fashioned parallel SCSI bus and FC/SAN where there are no hot-plug
events AFAIK.
In FC you get per-target events, although none for new LUs showing up
on a given target (in fact no SAM transport does the latter)
I believe some Fibre Channel storage arrays generate RSCN's when new
logical units are created (although I don't know if the existing Linux
Fibre Channel HBA drivers propagate these registered state change
notifications to the hot-plug subsystem).
I understand that many iSCSI storage arrays will generate a SCSI
Asynchronous Event Notification for the REPORTED LUNS DATA HAS CHANGED
Unit Attention condition that SPC-3 says shall be generated when a
target changes its logical unit inventory, provided that AEN's are
enabled in the control mode page.
So there are SAM transports that generate events when a new LU shows up.
I'm curious as to what plans, if any, exist for handling these events
in Linux.
Regards,
-Steve
--------
Steve Byan <smb@xxxxxxxxxxx>
Software Architect
Egenera, Inc.
165 Forest Street
Marlboro, MA 01752
(508) 858-3125
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