Topic
  • 2 replies
  • Latest Post - ‏2013-03-05T17:17:03Z by SystemAdmin
SystemAdmin
SystemAdmin
6902 Posts

Pinned topic TL update timing and do they need to be incremental?

‏2013-03-05T14:43:36Z |
I did a search.. and didn't really find anything on these and have poured through IBM's docs as well.

We have AIX 4, 5, and 6 servers and we need to get them all up to the latest 6 release, at least. Ultimately getting them all to the same levels for easier patch maintenance across the board.

1. It appears that you can update from 4 or 5 to 6 without rebuilding the box.. is that true? Or would best practices dictate rebuilding the server at the level we want it.. i.e. 6.x?

2. When, for example, going from TL1 to TL 4 do you need to update to TL2... then TL3... and then TL4 or can you go right to TL4? The IBM docs kind of insinuate that you probably do since the first update of the year includes just hardware and the second includes everything (or something like that). But does anyone have any practical insight they can share?

3. And finally.. what is the "average" time needed to do a TL update? I know hardware is a bit of a driving force in that but just need a rough estimate for planning purposes.

Than you all in advance.

AJ
Updated on 2013-03-05T17:17:03Z at 2013-03-05T17:17:03Z by SystemAdmin
  • SystemAdmin
    SystemAdmin
    6902 Posts

    Re: TL update timing and do they need to be incremental?

    ‏2013-03-05T17:17:02Z  
    First off, if you have AIX V4 systems they are likely on hardware that isn't supported by AIX 6 or AIX 7. Anything older than POWER4 will not run AIX 6.
    AIX V4 was designed to run directly on the hardware, whereas AIX 5 and later are designed to run virtualized on the Power hypervisor.

    In answer to #1, yes, in general you can do a migration upgrade to later levels of AIX (preserving the existing application environment), but in your case, with very old levels of AIX it is probably better that you do a fresh install of AIX 6 and them manually move applications, etc to the new OS.
    Speaking of which, you should be targeting AIX 7, not AIX 6 as your migration target. AIX 6 has been out since 2007 and is pretty long in the tooth at this point. My advice is to move to AIX 7 and save yourself another migration in a few years.

    #2 - you can upgrade from one TL to another without upgrading to an intermediate TL.

    #3 - The installation or upgrade time is going to vary depending on the type of installation and whether you are using NIM. You should consider using alt-disk-install and NIM to mimimize the downtime for upgrades.

    Other general recommendations:
    • Read the release notes
    • Upgrade adapter and system firmware before attempting the installation
    • Check for minimum system requirements like disk space and RAM
    • Use alt-disk-install or multibos to provide a backout path
    • Use NIM to deploy new AIX instances and upgrade existing AIX instances
    • Look that the AIX release strategy and best practices http://www-03.ibm.com/systems/power/software/aix/whitepapers/release_strategy.html
    • Subscribe to AIX and Power alerts and information at http://www-01.ibm.com/software/support/einfo.html
    • Read the Redbooks at redbooks.ibm.com on AIX Differences and migration
    jay
  • SystemAdmin
    SystemAdmin
    6902 Posts

    Re: TL update timing and do they need to be incremental?

    ‏2013-03-05T17:17:03Z  
    First off, if you have AIX V4 systems they are likely on hardware that isn't supported by AIX 6 or AIX 7. Anything older than POWER4 will not run AIX 6.
    AIX V4 was designed to run directly on the hardware, whereas AIX 5 and later are designed to run virtualized on the Power hypervisor.

    In answer to #1, yes, in general you can do a migration upgrade to later levels of AIX (preserving the existing application environment), but in your case, with very old levels of AIX it is probably better that you do a fresh install of AIX 6 and them manually move applications, etc to the new OS.
    Speaking of which, you should be targeting AIX 7, not AIX 6 as your migration target. AIX 6 has been out since 2007 and is pretty long in the tooth at this point. My advice is to move to AIX 7 and save yourself another migration in a few years.

    #2 - you can upgrade from one TL to another without upgrading to an intermediate TL.

    #3 - The installation or upgrade time is going to vary depending on the type of installation and whether you are using NIM. You should consider using alt-disk-install and NIM to mimimize the downtime for upgrades.

    Other general recommendations:
    • Read the release notes
    • Upgrade adapter and system firmware before attempting the installation
    • Check for minimum system requirements like disk space and RAM
    • Use alt-disk-install or multibos to provide a backout path
    • Use NIM to deploy new AIX instances and upgrade existing AIX instances
    • Look that the AIX release strategy and best practices http://www-03.ibm.com/systems/power/software/aix/whitepapers/release_strategy.html
    • Subscribe to AIX and Power alerts and information at http://www-01.ibm.com/software/support/einfo.html
    • Read the Redbooks at redbooks.ibm.com on AIX Differences and migration
    jay