[Solved] Clone or mirror your AIX OS larger disk to smaller disk ?
hello folks,
I have a 300GB ROOTVG volume groups with one filesystem /backup having 200GB allocated space
Now, I cannot alt disk clone or mirrorvg this hdisk with another smaller disk. The disk size has to be 300GB; I tried alt disk clone and mirrorvg , it doesn't work. you cannot copy LVs as operating system has some lv which cannot be copied other than mirrorvg..
is there a way to make another smaller hdisk = 10GB have a copy of only the AIX operating system from the already existing hdisk which is 300GB ?
You could do this.
1. Backup and delete the /backup filesystem
2. Add another smaller disk to the rootvg (make sure it is big enough to hold all the remaining LVs)
3. Move the LVs to the new disk with "migratepv -l ..."
4. Remove the 300GB disk from rootvg
5. Create a new VG (named something like backupvg) and create a /backup filesystem in it and mount it
6. Restore the /backup contents into the new /backup filesystem
Hi,
you may not be able to do a mirrorvg but I cannot see what would prevent you from mirroring the lv's (except the backup lv) after adding the smaller disk to rootvg - and then simply do a new bosboot on both disks and create a new bootlist ?
You could as well take (for safety purposes) take a mksysb from rootvg and exclude the backup filesystem.
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It took me too long to find the term I was looking for - kept thinking multi-boot (which is for something else!).
I think what you might be looking for is multibos. The trouble is going to continue to be that /backup is in rootvg and I do not know if it will be available on a second boot (with the multibos)
In short, what multibos does is copy the current rootvg (key) logical volumes - giving them different names (much like alt_disk_install does, but now within the current volume group).
Assumming /backup (since it is not a default rootvg logical volume) will be available after a reboot to the "other" rootvg you could attempt, assuming the sum of the current PP sizes are less than 10G:
For more on multibos look at two articles on IBM Systems Magazine: AIX-Updates-With-Multibos/ and Working with Multibos
However, I would also consider using the information above from ka00na and zxmaus to "almost" use mirrorvg - by just adding the key AIX partitions
to the 10G disk, backup and remove /backup; then remove the copies on original disk; and restore /backup - roughly this:
I have a 10GB hdisk with AIX 5.3 with 0 free PPs, and I assigned a 15GB hdisk
made a successful alt_disk_clone on the new empty disk , however the new cloned disk should have free PPs but as it is cloned there is no free PPs.
Is there any way to allocate free PPs for the volume group of the cloned disk ?
-g Will examine all the disks in the volume group to see if they have grown in size. If any disks have grown in size attempt to add additional PPs to PV. If necessary will determine proper 1016 multiplier and conversion to big vg.
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