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cggibbo commented June 15 2018 Comment Permalink
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Hi Jorge, yes, at a minmum, two disks are required for the actual live update process. And a third is (optionally) required for the clone of rootvg (should you choose to create one. Which you should because it's a great way to back-out. You should create the alt disk copy before you apply any fixes and/or start the live update operation). If you have paging and/or dump devices outside of rootvg, then you will need additional (temporary) disks for the live update process.

"If paging space is present on a non-rootvg disk, or if a memory dump device is present on the non-rootvg disks, two sets of disks must be provided (one set for the original partition and another set for the surrogate partition) with enough capacity for these paging spaces and memory dump devices. The preview mode of the Live Update operation can compute the required amount of space. These disks are available for reuse when the Live Update operation completes."

https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.install/lvupdate_configuration.htm

From the live update /var/adm/ras/liveupdate/lvupdate.template file:

# tohdisk = <disk1,disk2,...> The names of disks to be used as temporary
# storage for the Original. This is only required if the Original
# is using paging space or dump devices on non-rootvg volume groups. The
# capacity needs to match the total capacity of paging spaces and dump
# devices defined on non-rootvg volume groups for the original
# partition. (If previewing, size checking will be performed.)
# tshdisk = <disk1,disk2,...> The names of disks to be used as temporary
# storage for the Surrogate. This is only required if the Original is
# using paging space or dump devices on non-rootvg volume groups. It
# must have the same capacity as tohdisk. (If previewing, size checking
# will be performed.)

Jorge_Leon commented June 13 2018 Comment Permalink
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Thanks for this document Chris.

As I am new to Live Update, I'm a bit lost when it comes to applying new TL/SP levels... In addition to the two disks required by Live Update (I'm using HMCs), the clone of the OS done prior to the update then requires a 3rd disk? Or am I missing something here?

Cheers