Migrating a ServiceGuard cluster to another storage

Here are the steps for offline migrating a Serviceguard cluster to another SAN:

1. create a LUN list:no. of source box
   no. of source LUN
   size of source LUN

   no. of target box
   no. of target LUN
   size of target LUN
   

2. check the above excel sheet with a script – the sizes should be at least equal (or the target lun should be bigger)
   every source lun should have a pair on the target side
   every visible lun should be in the list
   etc…
3. ignite backup
4. downtime in monitoring system
5. create a list of external volume groups (excluded vg00 and vg01)
6. saving the output of read_lvmtab for further checking (contains the number of luns in every vgs)
7. serviceguard autostart off (/etc/rc.config.d/cmcluster), confidence reboot
8. exporting all external vgs – use the ‘-s’ option for vgexport! (with a for loop, use the list generated in step 5)
9. shutting down both server, after it they can be de-cabled from the old SAN
10. data migration – during the offline migration the servers can be restarted for patching and for ioconfig consolidation
11. after patching shutting down the server for recabling to the new SAN
12. ioscan, insf -  if the luns were not detected check the FC HBAs with fcmsutil for link
13. import the vgs with a for loop (see list in step 5), use the ‘-s’ option to vgimport!
14. compare the output of read_lvmtab with the old one (step 6), the no. of luns should be the same for each vgs, check if all vgs were succesfully imported
15. start the cluster and the packages, check package cntl logs, optionally enable cluster autostart if it was on