A file used for a logical disk may not be used for any other
 	logical disk, unless /SHARE is specified. If that is not done,
 	the driver will return SS$_FILALRACC. The same is true when one
 	tries to replace a device, the error returned in that case will
 	be SS$_DEVALLOC.

 	A containerfile for a logical disk must reside on an ODS-2 or
 	an ODS-5 volume. Spiralog volumes are not supported.

 	If a continuous trace is in progress it is impossible to
 	mount a logical disk because the reference count is not zero.
 	Stop the trace, mount the disk and restart the trace. No trace-
 	data will be lost because the driver will buffer this.

 	Container files may now reside on remotely mounted NFS volumes.
 	Note however that members of a shadowset may not be used if they
 	reside on such a device. This is because the NFSdriver does not
 	support the IO$_WRITECHECK function. This restriction may be
 	lifted in a future release.