This is a weird one that we ran into here at Clear Technologies.
Backstory
Customer had planned prolonged power outage and after restoring power and booting the system it had lost it’s date. It is very rare because it can only occur on certain days of the year, roughly 6 of them when power is turned off at the end of one month and turned back on the next month, even if that’s just a couple hours apart. Truly a rare encounter for sure. Below is more details and fix to the problem.
There is a known problem after upgrading your VIOS using the viosupgrade tool. IF your media repository resides on rootvg, which is often the case, it will no longer exist post upgrade. So you can either move it to non-rootvg disks, or save off/copy it’s contents elsewhere and recreate it after the upgrade. I did find additional details on this and it is available at:
https://www.ibm.com/support/pages/viosupgrade-virtual-media-library-lost-after-viosupgrade
There is another lessor known issue when upgrading and utilizing SEA and VLAN tagging.
Details are here: https://theibmi.org/2020/07/16/new-vios-releases-affect-the-shared-ethernet-adapter-sea-functionality/