Question regarding K22301343, extend /var/ folder after upgrade..

In Classic BIG-IP, the /shared/ (/tmp) mount is shared between boot locations, so it's always mounted in the same place before and after upgrades or switchboot. This TMI_VOLUME_FIX_VAR_MIB parameter specifies the size that TMOS should use when creating any *new* disk layout (a new layout is created when installing any image to another partition). The size of the current partition's /var/ mount is not relevant.

Importantly, this parameter overrides the default setting in the upgrade ISO, so if a newer version has a bigger default /var/ than your TMI_VOLUME_FIX_VAR_MIB setting, your custom config takes precedence.