DIRMC Saga Suggestions

Flex asked about DIRMC and I have had experience using it. When I was with IBM we used it to backup all the directories to disk and we kept them on disk for fast restore. This was especially useful when we ran into the know issue with MS checkdisk and cluster volumes with over 4 million files. The chkdsk would would run and strip all permissions from files and folders. Since our files inherited their permissions from the folder by restoring the directories we were able to quickly recover from the permission stripping without having to do a full restore.

DIRMC saga

Do you use DIRMC option?

If your answer is YES, could you describe why and how you use it?
I'm a bit confused regarding this topic... Do we have to use this feature at all?