You don't need to take down time at all. You can add the SAN disks to the same VG as your internal disks and mirror the data to them. After they sync you can break the mirror and keep on trucking. There are a ton of ways to move data around in AIX.
When you are dealing with critical, its always recommended to have down time for this activity. You may require down time for putting new SAN card if not there already.
Am not sure how best to mirror the disks for moving the data from local disks to SAN.
I suggest,
1. Take downtime, Backup all the critical one to tape.
2. Take msksysb backup as well.
3. you need to install the emc filesets in the aix box. AFter that you run #cfgmgr to recognize the EMC disks.
4. Add them to volumegroup.
5. You can use migratepv command to move the logical volumes ( from local disk to EMC disk).
6. Verify the all the logical volumes are on new disks.
7. Remove the local disks.
8. Take mksysb backup.
I assume that you will bring down all the application before taking the backup. After 1-8 steps, you will bring up all the applications again.
Hope it helps.
aixnag
IBM Certified Specialist - P-series AIX 5L Administration
IBM Certified Specialist - AIX V4 HACMP
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