Hi Hertha/Gerrard/Anyone else, Thanks for the previous excellent replies to my questions. Something new just surfaced with the NetApp SAN disks partitions that are presented to our RHES 4.6 : The current mappings on 1st server is : lrwxrwxrwx 1 root root 7 May 22 15:36 mpath0 -> ../dm-2 lrwxrwxrwx 1 root root 7 May 22 15:36 mpath1 -> ../dm-5 lrwxrwxrwx 1 root root 7 May 22 15:36 mpath2 -> ../dm-3 lrwxrwxrwx 1 root root 7 May 22 15:36 mpath3 -> ../dm-4 lrwxrwxrwx 1 root root 7 May 22 15:36 mpath4 -> ../dm-1 lrwxrwxrwx 1 root root 7 May 22 15:36 mpath5 -> ../dm-0 & "multipath -ll" gives : mpath0 (360a98000567244396334493370345055) [size=5 GB][features="1 queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [active] \_ 8:0:2:5 sds 65:32 [active] \_ 8:0:3:5 sdy 65:128 [active] \_ round-robin 0 [enabled] \_ 8:0:1:5 sdm 8:192 [active] \_ 8:0:0:5 sdg 8:96 [active] mpath1 (360a9800056724439633449336c786d69) [size=5 GB][features="1 queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [active] \_ 8:0:2:4 sdr 65:16 [active] \_ 8:0:3:4 sdx 65:112 [active] \_ round-robin 0 [enabled] \_ 8:0:0:4 sdf 8:80 [active] \_ 8:0:1:4 sdl 8:176 [active] On another Linux server (with cluster script /etc/init.d/o2cb_start.sh started), /dev/mpath/mpath0 or mpath1 or ... mpathx completely maps to different minor devices /dev/sd... So we mounted on server 1 a partition (formatted as ocfs using ocfs2console) first & create a test file on it & then on server 2, we mount mpath0/.../mpathx one after another to see which of it has the test file on it to identify it. We then put in vfstab the /dev/mpath/mpathx & mountpoint for each server that we have determined the hard way. Alas, after we rebooted both the servers, all the mappings became different ie on server 1 where mpath0 ->../dm-2 became mpath0 ->../dm-4 after reboot & on server 2 where mpath0 ->../dm-1 became mpath0 ->../dm-3 after reboot. Oracle told us to use /dev/mapper/mpathx - this appears to be more reliable (ie it's fixed to a specific partition regardless of how many reboots are done). Can someone explain what's the differences between /dev/mpath/mpathx & /dev/dm-x & /dev/mapper/mpathx Or I've not completely installed all the required stuff from NetApp on our Redhat servers yet that triggers this? Thanks U -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
