Hmm, A reproduction case is going to be necessary, there are some weird things going on in syslog.2 which I'm unfamiliar with. Unfortunately, I don't have access to a symmetrix either. I really need to have multipathd running in the foreground, with full logging to a file, to catch what went down.
>From 7/27/12 00:38:48 -- 00:38:58 I just see lines and lines of this: Jul 27 00:38:58 Linux51 multipathd: mpath12: sdm - emc_clariion_checker: Logical Unit is unbound or LUNZ For about every block device, this messages means the path is down. It's safety against issuing IO to a LUNZ which will block forever. libmultipath/checkers/emc_clariion.c if ( /* LUN should at least be bound somewhere and not be LUNZ */ sense_buffer[4] == 0x00) { MSG(c, "emc_clariion_checker: Logical Unit is unbound " "or LUNZ"); return PATH_DOWN; } After a few filters... Jul 27 05:45:36 Linux51 kernel: [188724.191711] scsi 6:0:0:0: Direct-Access DGC LUNZ 0532 PQ: 0 ANSI: 4 Jul 27 05:45:36 Linux51 kernel: [188724.193584] scsi 6:0:1:0: Direct-Access DGC LUNZ 0532 PQ: 0 ANSI: 4 Jul 27 05:45:43 Linux51 kernel: [188730.940803] scsi 5:0:0:0: Direct-Access DGC LUNZ 0532 PQ: 0 ANSI: 4 Jul 27 05:45:43 Linux51 kernel: [188730.942590] scsi 5:0:1:0: Direct-Access DGC LUNZ 0532 PQ: 0 ANSI: 4 ok, that's 4, but there were dozens in the logs, which means the rest were unbound. Then there's this, Jul 27 00:39:49 Linux51 udevd[26799]: timeout '/sbin/blkid -o udev -p /dev/dm-53' Jul 27 00:39:49 Linux51 udevd[26794]: timeout '/sbin/blkid -o udev -p /dev/dm-52' Jul 27 00:39:50 Linux51 udevd[26848]: timeout: killing '/sbin/blkid -o udev -p /dev/dm-66' [26890] Jul 27 00:39:50 Linux51 udevd[26857]: timeout: killing '/sbin/blkid -o udev -p /dev/dm-60' [26899] ... Something is off, if multipath did create two maps to the same device I suspect it to be a victim of these path availability issues. <11:37:45>multipath_conf$ zcat syslog.2.gz | grep unbound | sort -u | wc -l 43055 That can't be right. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to multipath-tools in Ubuntu. https://bugs.launchpad.net/bugs/1030040 Title: multipath-tools create duplicate device To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1030040/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs