Assign DBRoot command failed - setFilesPerColumnPartition Failed

Customer has a system with 3 pms using 1 dbroot per with external storage. They wanted to add 3 more dbroots making 2 dbroot per pm.

They got this error:

root@usiadmdmaxp01:~# mcsadmin assignDbrootPmConfig 4 pm1
assigndbrootpmconfig Thu Jan 17 15:41:44 2019

DBRoot IDs assigned to 'pm1' = 1

Changes being applied

DBRoot IDs assigned to 'pm1' = 1, 4

ERROR: old FilesPerColumnPartition not a multiple of DBRootCount

• • • • setFilesPerColumnPartition Failed

• • • • Failed Assign of DBRoots: API Failure return in assignPmDbrootConfig API

I believe the error is coming from this check in the oam api setFilesPerColumnPartition

if ( oldFilesPerColumnPartition != oldSystemDBRootCount *
(oldFilesPerColumnPartition / oldSystemDBRootCount) )

I think you arent allowed to change this setting of FilesPerColumnPartition to something that isnt a equal to a multiple of the original setting.

This just might need to be documented. But maybe it could require a code change to allow.