I submitted this issue to Github here, but as this might be an Azure issue it was suggested I post here as well.
In a nutshell, I’m allocating four volumes, which in Ubuntu 18.04 always resulted in the following devices:
sda sda1 sdb sdb1 sdb14 sdb15 sdc sdd sde sdf
sda is the OS volume, sdb is the tmp volume, and sd[cdef] are the four data volumes. Note that the OS volume gets partition sda1, and the tmp volume gets partitions sdb1|sdb14|sdb15. At this point we typically run “mkfs” on the data volumes and mount them.
With Ubuntu 20.04, tmp is being assigned to a random volume; for example, on this particular run, /dev/sde became the tmp volume:
sda sda1 sdb sdc sdd sde sde1 sde14 sde15 sdf
Thanks for any help or insight you can provide.