On Fri, 2005-04-01 at 10:35 +0200, Christophe Varoqui wrote: > 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. > The problem that I have been encountering is multipathd never testing for the path (iSCSI Channel 20 in the above example) once the struct scsi_device goes from a blocked to unblocked state. Is there anything that I am missing in the setup in the above example? Thanks! -- Nicholas A. Bellinger <nick@xxxxxxxxxxxxxxxxxxx>
