The maximum size of a POSIX file is also limited by the size of the file system in which it is located, i.e by the size of the container file in BS2000, see "Storing POSIX file systems in container files". Previously, a container file could not be larger than 2 gigabytes, as it was addressed internally by an integer-type variable.
Since a long long-type variable can now be used to address a file internally, a much greater range can be addressed. Consequently, container files and thus POSIX file systems as well can be larger than 2 gigabytes.
The following table shows the limit values for BS2000 files and POSIX file systems:
Size of a BS2000 file | Size of the POSIX file system |
max. 4096 gigabytes (= 4 terabytes) | max. 1024 gigabytes (= 1 terabyte) |
The difference between the maximum size of BS2000 files and the maximum container size is determined by the nature of the implementation in POSIX.
The size of a container file and thus of a POSIX file system is defined when it is created with the administration tool POSINST, see “Administer POSIX filesystems”.