1.7 Upper Limits of the File System

The following table lists the upper limits of the GFS Shared File System on a file system basis.

Table 1.1 Upper limits of file system
Item	Upper limit
Maximum file system capacity	1 terabyte - 1 kilobyte
Maximum partitions size	1 terabyte
Maximum file size	1 terabyte - 512 byte
Maximum number of sharable nodes	2 nodes
Maximum directory size	2 gigabytes - 1 kilobyte
Maximum number of partitions consisting of a file system	32 partitions
Maximum number of i-nodes per file system	16 mega
Maximum number of directories per file system	1 mega
Maximum number of concurrently open files	5000 files (*1)

*1 Maximum number of files can be opened at a time on one node.

The maximum number of GFS Shared File Systems in a cluster system is 10.

Note

We recommend you to lessen the number of the GFS Shared File Systems simultaneously used in one cluster system as much as possible. When you use many GFS Shared File Systems, please allot a sufficient number of CPUs to relevant nodes, and carry out system verification in advance.