We are trying to troubleshoot a problem with our tsm disk storage.

Tsm server 6.3.4 running on RHEL 6.5.
Our storage is a set of subdirectories on a file system mounted via nfs v3 to 
all three of our tsm servers.

All goes fine until an attempt is made to define one or more volumes to a 
storage pool.
At that time, if other tsm servers are writing to the storage, those volumes 
will become red-only when the volume define is in process.

Other operations, such as reclamation, and normal writing do not cause problems.

Our storage provider, (nexenta) is asking what tsm does when creating a storage 
volume.
So, I am coming to the list for information.  Just what does tsm do under the 
covers when defining a storage volume?

Thanks for any help.