Installation guide

Option Description

tailed troubleshooting information. Use this option

with care.

Note: This option is turned on automatically if

lock_nolock locking is specified; however, you can

override it by using the ignore_local_fs option.

upgrade Upgrade the on-disk format of the file system so

that it can be used by newer versions of GFS.

Table 4.2. GFS-Specific Mount Options

3. Unmounting a File System

The GFS file system can be unmounted the same way as any Linux file system — by using the

umount command.

Note

The umount command is a Linux system command. Information about this com-

mand can be found in the Linux umount command man pages.

Usage

umount MountPoint

MountPoint

Specifies the directory where the GFS file system should be mounted.

4. GFS Quota Management

File-system quotas are used to limit the amount of file-system space a user or group can use. A

user or group does not have a quota limit until one is set. GFS keeps track of the space used by

each user and group even when there are no limits in place. GFS updates quota information in

a transactional way so system crashes do not require quota usages to be reconstructed.

To prevent a performance slowdown, a GFS node synchronizes updates to the quota file only

periodically. The "fuzzy" quota accounting can allow users or groups to slightly exceed the set

limit. To minimize this, GFS dynamically reduces the synchronization period as a "hard" quota

limit is approached.

GFS uses its gfs_quota command to manage quotas. Other Linux quota facilities cannot be

used with GFS.

3. Unmounting a File System