Hello,
You do not need to perform extension on the second server. Infact you should not attempt to.
When you extended it on the primary server, it already modified the LVM headers on the disks with the new information. Now the disks being shared and viewable by both servers in the cluster (as it should be), you only need to update the lvmtab and create relevant device files for the new luns, on the secondary server.
Follow below:
perform ioscan and ensure disks are claimed
#insf -e #Creates device files
On Primary server:
For each vg that that you added luns to, that is shared and active on primary server, do
#vgexport -p -v -s -m #Creates map file with all lv info
Copy this map file to the secondary server
On Secondary server:
Note down the minor numbers of the group file
#ll /dev/vg*/group > tmpfile
For each vg that you added luns to, shared, and that is active now on primary server, do
#vgexport vgname # Exports and removes configuration
#mkdir /dev/vgname
#mknod /dev/vgname/group c 64 # This creates the device file with the same minor number as before.
#vgimport -s -v -m # This will scan all the available disks, match them with the vgid, import with relevant pvs and create device files for lvols.
Remember that a different map file needs to be used for each vg.
And all this can be performed WITHOUT down time when the cluster and packages are up and running :)
