11.2.4 Setting fstab

In the GFS Shared File System, it is necessary to code an entry that is to be mounted on /etc/fstab of all the nodes that share a file system. The entry to the same file system should be corresponding by all nodes that share the file system.

Entry of GFS Shared File System sets it to /etc/fstab explains as follows.

device to mount field
Specify the path name of a block special file to the representative partition of the GFS Shared File System which does the mount.
mount point field
Specify a directory becoming the mount point at the time of the abbreviation.
Please specify the directory which there is in all nodes using file system in common.
file system type field
As a type of the file system, please specify sfcfs.

mount options field

Please specify a mount option used in a mount.
Please specify noauto by all means.
The following table shows the detail of the mount options.

Table 11.2 Mount options
Option	Description
atime \| noatime \| relatime \| strictatime	Sets the method to update the last access time of a file. If atime or relatime is specified, the last access time of a file is updated when the previous last access time is the same as or older than the last modify time or the last change time. Also, when the previous last access time of a file is old for over a day, it is updated. If noatime is specified, the last access time of a file is not updated. If strictatime is specified, the last access time of a file is updated for each file access. The default is relatime.
atrc \| noatrc	Specifies whether to mount (atrc) or not to mount (noatrc) at the node startup. The default is atrc.
async	Mounts in the manner of processing any I/O for the file system asynchronously. The default is async.
defaults	Synonymous with rw,suid,dev,exec,and async.
dev \| nodev	Mounts making character special file and block special files available(dev) or unavailable (nodev). The default is dev.
exec \| noexec	Mounts giving permission(exec) or no permission(noexec) to execute binary files on the file system. The default is exec.
rw \| ro	Mounts the file system as read/write enabled(rw) or read only(ro). The default is rw.
suid \| nosuid	Disallows a setuid execution. By default, allows setuid execution. The default is suid.

dump frequency field
0 Please specify.
fsck pass field
0 Please specify.

Information

By writing the entries concerning the created file system in /etc/fstab on the node that does not share the file system, you can prevent the file system from being used by mistake as other file systems.

Examples of /etc/fstab entries are shown below:

Table 11.3 When mounting in rw mode at startup of the node:
Parameter	Value
device to mount	/dev/sfdsk/gfs01/dsk/volume01
mount point	/mnt/fs1
file system type	sfcfs
mount options	rw,noauto
dump frequency	0
fsck pass	0

Table 11.4 When mounting is not performed at startup of the node
Parameter	Value
device to mount	/dev/sfdsk/gfs01/dsk/volume01
mount point	/mnt/fs1
file system type	sfcfs
mount options	rw,noauto,noatrc
dump frequency	0
fsck pass	0