upgrade headaches from 9.4 to 11.3

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When upgrading from 9.4.8 to 10.2.4, it is critical to change the disk structure from "partitions" to "volumes". Since v10 worked on either partition or volume, I decided not to reformat the disk. I upgraded to v10, successfully running on partition.

But ... Partitions caused the subsequent upgrade from 10.2.4 to 11.3.0 to fail. I believe v11 is volume-only. It could neither install on partition nor convert the existing partition to volume. Upgrade fails instantly, both via the web interface and using image2disk --format=volumes.

SOLUTION: Using image2disk, I applied the 10.2.4 iso image overtop of the existing 10.2.4 install.

image2disk --format=volumes BIGIP-10.2.4.577.0.iso

This converts disk config from partitions to volumes. Once that conversion completed, then applying the upgrade to 11.3.0 worked automagically via the web interface.