gfs_tool (8) - Linux Manuals

gfs_tool: interface to gfs ioctl calls

NAME

gfs_tool - interface to gfs ioctl calls

SYNOPSIS

gfs_tool COMMAND [OPTION] [PARAMETERS ...]

DESCRIPTION

gfs_tool is an interface to a variety of the GFS ioctl calls.

Specifying gfs_tool -h prints gfs_tool command line usage (help).

Specifying gfs_tool -V prints the gfs_tool version information.

COMMANDS

clearflag Flag File1 File2 ...

Clear an attribute flag on a file.

counters MountPoint [-c] [-i interval]

Print out statistics about a filesystem. If -c is specified, gfs_tool keeps running printing out the statistics once per second or, if specified, the interval given with the -i option, in seconds.

df MountPoint [-k]|[-H]

Print out a space usage summary of a given filesystem. The information printed is more detailed than a standard "df". If -k is specified, the output is given in kilobytes (KB). If -H is specified, the output is given in human readable format (similar to df -h). If neither -k nor -H are specified, the output is given in file system blocks.

freeze MountPoint

Freeze (quiesce) a GFS cluster.

getsb MountPoint

Print out the superblock of a mounted filesystem.

gettune MountPoint

Print out the current values of the tuning parameters in a running filesystem.

jindex MountPoint

Print out the journal index of a mounted filesystem.

layout File [buffersize]

Print out on-disk layout information about a file or directory. Buffersize is the size of the buffer (in bytes) that gfs_tool allocates to store the file's metadata during processing. It defaults to 4194304 bytes. If you are printing a very big directory you may need to specify a bigger size.

list

List the currently mounted GFS filesystems. Each line represents a filesystem. The columns represent (in order): 1) A number that is a cookie that represents the mounted filesystem. 2) The name of the device that holds the filesystem (well, the name as the Linux kernel knows it). 3) The lock table field that the filesystem was mounted with.

lockdump MountPoint [buffersize]

Print out information about the locks this machine holds for a given filesystem. Buffersize is the size of the buffer (in bytes) that gfs_tool allocates to store the lock data during processing. It defaults to 4194304 bytes.

margs arguments

This loads arguments into the module what will override the mount options passed with the -o field on the next mount. See mount.gfs(8).

reclaim File

Returns unused on-disk metadata blocks to free blocks.

rindex MountPoint

Print out the resource group index of a mounted filesystem.

quota MountPoint

Print out the quota file of a mounted filesystem. Also see the "gfs_quota list" command.

sb device proto [newvalue]

View (and possibly replace) the name of the locking protocol in the file system superblock. The file system shouldn't be mounted by any client when you do this.

sb device table [newvalue]

View (and possibly replace) the name of the locking table in the file system superblock. The file system shouldn't be mounted by any client when you do this.

sb device ondisk [newvalue]

View (and possibly replace) the ondisk format number in the file system superblock. The file system shouldn't be mounted by any client when you do this. No one should have to use this.

sb device multihost [newvalue]

View (and possibly replace) the multihost format number in the file system superblock. The file system shouldn't be mounted by any client when you do this. No one should have to use this.

sb device all

Print out the superblock.

setflag Flag File1 File2 ...

Set an attribute flag on a file. There are four currently supported flags. They are jdata, directio, inherit_jdata, and inherit_directio.
   The jdata flag causes all the data written to a regular file to be journaled. The jdata flag can only be set (or cleared) if the file is zero length.

The directio flag causes all I/O to a regular file to be Direct I/O, even if the O_DIRECT flag isn't used on the open() command.

The inherit_jdata flag is set on a directory. It causes all new regular files created in that directory automatically inherit the jdata flag. The inherit_jdata is also inherited by any new subdirectories created in that directory.

The inherit_directio flag is set on a directory. It causes all new regular files created in that directory automatically inherit the directio flag. The inherit_directio is also inherited by any new subdirectories created in that directory.

settune MountPoint parameter newvalue

Set the value of tuning parameter. Use gettune for a listing of tunable parameters.

shrink MountPoint

Causes any unused inodes to be thrown out of memory.

stat File

Print out extended stat information about a file.

unfreeze MountPoint

Unfreeze a GFS cluster.

version

Print out the version of GFS that this program goes with.

withdraw MountPoint

Cause GFS to abnormally shutdown a given filesystem on this node.