How can I tell what is causing LVM on multipath volumes to fail, while direct multipath volumes are working? The details: I have several volumes that are multipathed over fibre channel (2 qlogic cards in the host) from a Fujitsu Eternus 4000 (4 controllers). When using a file system mounted on the dm-multipath device directly (Ie.: generating I/O via IOZone), it fails over gracefully when I pull out either of the fibre pairs, and the file system continues to operate. This device is called /dev/mapper/zimbra-mb1-t2-v4_fujitsu1-lun66. However, when I access an LVM volume created with sister devices as PVs, the LVM presented volume does not fail over. Rather the LV device goes inaccessible and the file system (ext3) re-mounts itself as read-only. If I try to access any of the underlying PVs, they still respond as available (Ie.: fdisk -l $PV). I am not seeing duplicate devices, and am using the following filter in /etc/lvm/lvm.conf: filter = [ "a|^/dev/md.*|", "a|^/dev/mapper/zimbra-mb.*-t.*-v.*_.*-lun.*|", "r|.*|" ] I have also added the following, but dm-multipath devices seem usable by LVM with or without this setting: types = [ "device-mapper", 1 ] I have tried removing the /etc/lvm/cache/.cache file, but that seems to have had no effect. I've also tried re-building the initrd after modifying the lvm.conf file, also with no effect. Additional info: root@zimbra-mb1:~# pvs PV VG Fmt Attr PSize PFree /dev/mapper/zimbra-mb1-t1-v1_fujitsu1-lun55 mb1_t1 lvm2 a- 195.31G 60.31G /dev/mapper/zimbra-mb1-t1-v2_fujitsu1-lun56 mb1_t1 lvm2 a- 195.31G 60.31G /dev/mapper/zimbra-mb1-t1-v3_fujitsu1-lun57 mb1_t1 lvm2 a- 195.31G 60.31G /dev/mapper/zimbra-mb1-t1-v4_fujitsu1-lun58 mb1_t1 lvm2 a- 195.31G 60.31G /dev/mapper/zimbra-mb1-t2-v1_fujitsu1-lun63 mb1_t2 lvm2 a- 504.00G 4.00G /dev/mapper/zimbra-mb1-t2-v2_fujitsu1-lun64 mb1_t2 lvm2 a- 488.28G 0 /dev/mapper/zimbra-mb1-t2-v3_fujitsu1-lun65 mb1_t2 lvm2 a- 195.31G 195.31G /dev/mapper/zimbra-mb1-t2-v5_fujitsu1-lun67 mb1_t2 lvm2 a- 354.37G 0 /dev/mapper/zimbra-mb1-t2-v6_fujitsu1-lun68 mb1_t2 lvm2 a- 234.56G 77.21G /dev/md1 zimbra-mb1 lvm2 a- 136.50G 83.50G kernel version: 2.6.24-24-server distoro: Ubuntu Hardy multipath-tools: 0.4.8-7ubuntu2 lvm2: 2.02.26-1ubuntu9 Thanks! -Brian _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
