Hi all, this patchset modifies multipathing to allows zero paths to a multipath path target. This is required to make root on multipath working correctly even when all paths are temporarily down. Previously multipath would _not_ remove the reference for the last path from the multipath target. This caused a reference to a stale/dead device still to be present in the kernel, which has quite a lot of interesting side effects. Not the least to multipath itself, which failed to reconnect the resumed path correctly to the map, causing the same path to appear twice in the map. With this patchset we can now shed the last reference, too. Hence the device can be freed properly from within the kernel and multipathd is able to setup the correct map once the paths reappear. And they will even get the same device numbers again. Any I/O during that time will be queued if the 'queue_if_no_path' feature is present, otherwise it will be returned with -EIO. But this is already done correctly within the dm-mpath module; the only change there is the lowering of the lowest acceptable path priority group number, which of course should be '0' now. Please apply. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Markus Rex, HRB 16746 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
