Logical Partition Mirror

[dessner]

I currently have 2 disks(hdisk0,hdisk1) assigned to the rootvg and 1 logical volume lvhci. The logical volume is configured to keep 2 copies of all logical partitions and to keep the copy on a different physicial volume than the original copy. In other words, copy1 on hdisk0 and copy2 on hdisk1. All Physicial partitions are allocated on hdisk0 and hdisk1.

My question - if I add 2 disks(hdisk2,hdisk3) to rootvg, will I be able to increase the number of logical partitions and have copy1 continue on hdisk2 and copy2 on hdisk3?

 

[bjverzal]

Within the LVM, you can tell it where to limit the places to put the LP's. Just change the Physical Volume options under smitty|System Storage Management|Logical Volume Manager|Logical Volumes.

I would do the following:
1. Create a new volume group
2. Move the Logical Volume to the new Volume Group
3. Mirror it with hdisk2 and hdisk3
4. Mirror rootvg across hdisk0 and hdisk1

I always limit rootvg to AIX operating system related files only. No exceptions. This makes O/S upgrades much easier.

If you choose not to do this, then do the same 4-steps, but just add the disks to rootvg instead.

Bill.