[dm-devel] dm-multipath + iscsi-initiator-core success, example, and questions

[Christophe Varoqui]

On Thu, Mar 31, 2005 at 03:52:11PM -0800, Nicholas A. Bellinger wrote:
> 
> ...
>
> IO never goes back across iSCSI Channel 20.  I also noticed that this
> does not occur every time iSCSI Channel 20 is paused.  Sometimes IO will
> stop over iSCSI Channel 21 as well, but iSCSI Channel 20 can be started
> and IO resumes correctly to both iSCSI Channels.
> 
> So my main question is this, once the iSCSI Channel is restarted and IO
> is allowed to flow again, how does dm-multipath know that the device is
> unlocked and online?
> 
It's userspace responsability to maintain the device map.
In the current available implementation, multipathd does the path checking and reinstate offline paths when they come back up.

Regards,
cvaroqui