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Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - Storage
Product - Tivoli Storage Manager (TSM) Family
For recording keeping, the previous attributes were:
Brand - Tivoli
Product family - Storage
Product - Tivoli Storage Manager (TSM) Family
closing since no additional info provided
Trying again:
With multiple directories, there is not a size restriction relating to use of one directory or another. If there were such a restriction it would have been documented.
The algorithm for choosing is not documented, but is currently loosely round-robin. IBM doesn't recommend using multiple directories in the same file system because it makes space checks unreliable ( aside from the possibility of I/O contention depending upon the underlying physical space layout ).
If there is a problem with multiple sessions and allocation within multiple directories, a service call is advisable or please append additional information as to why it's thought
that this restriction exists. Please ensure that the client is configured for multiple sessions with multiple mountpoints -- Check the client resourceutilization option as well
as the node's maxnnump value, along the mountlimit parameter on the device class.
An out-of-band observation:
Assuming that the NFS mounts are for output directories, please be aware that NFS must be configured in a manner which ensures that I/O results in data being written in a non-volatile manner - it is not acceptable to have I/O fail on the NFS server after TSM has been notified that data was successfully written. NFS can be configured for maximum performance at the expense of reliability.
File system requirements are covered in the Administration guide.