Unsupported upgrade scenarios with the viosupgrade tool
Learn about the scenarios that are not supported for upgrade with the Virtual I/O Server (VIOS) upgrade tool.
Full cluster restore in a single instance is not supported
The VIOS upgrade tool supports backup and restore of VIOS at cluster level with the -c flag. However, full cluster restore in a single instance is not supported in the VIOS 3.1 release. Hence, when you upgrade VIOS nodes that belong to a Shared Storage Pool (SSP) cluster, irrespective of the number of nodes, you must upgrade a few nodes at a time, while keeping the cluster running on the other nodes. Failure to do so might result in the loss of cluster connectivity.
Rootvg LV backed vSCSI disk backup restore not supported
Currently, the viosbr command does not support virtual SCSI (vSCSI) disks that are created on the rootvg disks of the Virtual I/O Server. Hence, the VIOS upgrade tool cannot be used to restore vSCSI mappings if Logical Volumes (LVs) are created from a rootvg disk. You must move the vSCSI disks from the rootvg to other volume groups before you initiate the upgrade process. Alternatively, you can start the installation on an alternative disk by preserving the current rootvg.
For more information about using Logical Volume Manager (LVM) commands (such as the cplv command) to migrate these vSCSI logical volumes, see IBM Moving a JFS/JFS2 File System to a New Volume Group.