GPFS: Administration and Programming Reference - IRA Home

-j scatter Block allocation type
-D posix File locking semantics in effect
-k posix ACL semantics in effect
-a 1048576 Estimated average file size
-n 32 Estimated number of nodes that will mount file system
-B 262144 Block size
-Q none Quotas enforced none
none Default quotas enabled
-F 34816 Maximum number of inodes
-V 9.03 File system version. Highest supported version: 9.03
-u yes Support for large LUNs?
-z no Is DMAPI enabled?
-d gpfs1nsd;gpfs2nsd;gpfs3nsd;gpfs4nsd Disks in file system
-A no Automatic mount option
-E no Exact mtime default mount option
-S no Suppress atime default mount option
-o none Additional mount options
-T /fs1 Default mount point
See the “mmlsfs Command” on page 209 for complete usage information. See the General Parallel File
System: Concepts, Planning, and Installation Guide and search on GPFS architecture and file system
creation considerations for a detailed discussion of file system attributes.
Modifying file system attributes
Use the mmchfs command to modify existing file system attributes.
Note: All files created after issuing the mmchfs command take on the new attributes. Existing files are
not affected. Use the mmchattr command to change the replication factor of existing files. See
“Querying and changing file replication attributes.”
For example, to change the default data replication factor to 2 for the file system fs1, enter:
mmchfs fs1 -r 2
To confirm the changes, enter:
mmlsfs fs1 -r
The system displays information similar to:
flag value description
---- -------------- -------------------------------------------------------
-r 2 Default number of data replicas
See the “mmchfs Command” on page 103 and the “mmlsfs Command” on page 209 for complete usage
information. See the General Parallel File System: Concepts, Planning, and Installation Guide and search
on GPFS architecture and file system creation considerations for a detailed discussion of file system
attributes.
Querying and changing file replication attributes
If your availability requirements change, you can have GPFS display the current replication factors for one
or more files by issuing the mmlsattr command. You might then decide to change replication for one or
more files with the mmchattr command.
Querying file replication
Specify one or more file names with the mmlsattr command. For example, to display the replication
factors for two files named project4.sched and project4.resource in the file system fs1, enter:
mmlsattr /fs1/project4.sched /fs1/project4.resource
18 GPFS: Administration and Programming Reference