If activity for a file system becomes so extensive that accesses are slow, you can do one of the following tasks:

• Move the file system to a volume that processes I/O more quickly, for example, a volume that has a faster channel or a cached storage control.
• Move a subtree from the full file system into a new file system on a different volume. Mount the new file system on the now-empty directory, which was the head of the subtree. This divides I/O activity between two volumes. To avoid failures from this action, define symbolic links using the original names.