Best Options for Post-i 6.1.1 Upgrade Backups
April 20, 2011 Hey, Joe
We’re performing an i/OS 6.1.1 upgrade this weekend. My boss wants to perform a full system backup after we get done. However, full system backups take six-hours to run in my shop. I have a very tight upgrade window, and the machine can only be down for 18 hours. What’s my best option for backing up a newly upgraded operating system?
There are two overriding goals in tight operating system upgrade scenarios: 1) Protect your work so that you don’t have to perform an i 6.1.1 upgrade a second time if the machine crashes; and 2) Get the machine up and running again as quickly as possible. These goals are not incompatible.
If you’re time constrained after an upgrade, your best bet is to perform a post-upgrade licensed code and QSYS library backup by using the Save System (SAVSYS) command. Run SAVSYS in lieu of a full system backup. A SAVSYS backup performs the following backup functions.
With a SAVSYS backup, you can quickly save your new operating system objects immediately after the upgrade. You can then perform a Save While Active backup for the rest of your system, including non-QSYS IBM libraries, user data libraries, DLO folders, and the AS/400 Integrated File System (AS/400 IFS). Using these two backups together, you will perform the equivalent of a full system backup with minimum downtime. For more information on save while active backups, see this on article programming a simple save while active program.
One major point to remember is that while performing a SAVSYS backup, you must backup the objects to a device that can be used as an alternate IPL device. If you don’t backup to an IPL device, you won’t be able to restore the system from the SAVSYS media, if necessary. You must also put your system in restricted state to run this command, but don’t worry. SAVSYS backups run quickly.
For timing issues, another consideration is to deal with any potential upgrade speed bumps before the upgrade starts. Here are some things you can do to minimize upgrade slowdowns.