Thanks for the info.
One more question, I just looked through the iscsi.conf file and the README but I do not see a setting for explicitly setting dm-multipath. How do I enable it? -geoff Geoff Galitz Blankenheim NRW, Deutschland http://www.galitz.org -----Original Message----- From: firstname.lastname@example.org [mailto:[EMAIL PROTECTED] On Behalf Of Mike Christie Sent: Montag, 23. Juni 2008 23:44 To: email@example.com Subject: Re: iSCSI and filesystem error recovery galitz wrote: > > > I am evaluating iSCSI in our production environment and have a > question. > > When I induce a failure by powering down the iSCSI target while there > is active traffic and then restore the iSCSI target 5+ minutes later, > the filesystem remains in read-only mode. Fair enough, I see by > reading the docs that anytime a filesystem error is generated the > filesystem is made read-only. > > I can clear this by ummounting and then remounting the filesystem. Is > there a more elegant or a recommended way of restoring the filesystem > to a read-write state once the iSCSI target has returned to service? > > Ideally we'd like this to be a transparent process. Perhaps dm- > multipath is what I need? > I think dm-multpath is best. But if you setup dm-multipath to eventually return IO errors to the layer above it, then you will have the same problem. At the iscsi layer you can set node.session.timeo.replacement_timeout to a higher value and that is how long we will hold onto IO before failing it (default is 2 minutes). There is a bug in this code where we can only hold on to it for so long. I just did this patch against 269.2 which allows you to set the node.session.timeo.replacement_timeout to 0 which will hold onto the IO until we reconnect. At the dm multipath layer you can set the no_path_retry to do the same thing. If you set this to queue it will hold onto IO forever or until the user intervenes. But like I said if you get FS errors then you have to unmount and remount. If your questions was about that then there is nothing I can do. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to firstname.lastname@example.org To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---