D.2.1 fstab Settings for DFS Management Server

DFS entries must be added to /etc/fstab in order to perform mount at the DFS management server.

The DFS entries to be set in /etc/fstab are explained below.

Field 1 (fs_spec)
Specify the representative partition of the DFS to be mounted.
Field 2 (fs_file)
Specify the directory to be used as the default mount point.
Specify a directory that exists at all servers where the DFS is to be mounted.
Field 3 (fs_vfstype)
Specify the pdfs.

Field 4 (fs_mntops)

Specify the mount options to be used when mount is performed.
Ensure that the noauto option is specified.

Determine other option specifications as shown below.

Table D.4 Determining mount options
Item to be checked	Option to be specified
If either of the following applies: The file final reference time is not updated The DFS is shared by five or more servers	noatime
If not performing mount at DFS management server startup	noatrc
If mounting DFS as read only	ro

See

Refer to pdfsmount under "Appendix A Command Reference" in the "Primesoft Distributed File System for Hadoop V1 User's Guide" for mount option details.

Field 5 (fs_freq)
Specify 0.
Field 6 (fs_passno)
Specify 0.

An example of /etc/fstab settings is shown below.

Example: DFS management server fstab settings

# cat /etc/fstab  <Enter>
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=SWAP-hda5         swap                    swap    defaults        0 0

/dev/disk/by-id/scsi-1FUJITSU_300000370106 /mnt/pdfs    pdfs    noauto, noatime        0 0