What is the fifth field in etc fstab file?
Backup operation – the fifth field contains a 1 if the dump utility should back up a partition or a 0 if it shouldn’t. If you never use the dump backup program, you can ignore this option. File system check order – the sixth field specifies the order in which fsck checks the device/partition for errors at boot time.
What are the last2 numbers in fstab?
The last two fields on each line in fstab ( dump and pass ) are some numbers (usually, 0 ).
What is FS dump?
Description. Dump examines files on an ext2/3 filesystem and determines which files need to be backed up. These files are copied to the given disk, tape or other storage medium for safe keeping (see the -f option below for doing remote backups).
What is restore dump?
The DFSMSdss DUMP command is used to back up tracks, volumes, and data sets, whereas the RESTORE command is used to recover them. DFSMSdss may be used for the following backup functions: Back up data on direct-access storage devices (DASD).
What is Linux dump?
dump command in Linux is used for backup the filesystem to some storage device. It backs up the complete file system and not the individual files. In other words, it backups the required files to tape, disk or any other storage device for safe storage. It also prints the version number of the dump command being used.
What does the fifth field in fstab mean?
The fifth field, (fs_freq), is used for these filesystems by the dump (8) command to determine which filesystems need to be dumped. If the fifth field is not present, a value of zero is returned and dump will assume that the filesystem does not need to be dumped.
What do you need to know about the fstab file?
The first thing we must know about the fstab file is that is meant to be only read by programs and never written except by the system administrator. Each line in the file describes a filesystem, and contain fields used to provide information about its mountpoint, the options which should be used when mounting it etc.
When to use CIFs as a fstab field?
In case of a remote filesystem we can use, for example cifs as the value of this field if the filesystem is shared via samba or nfs if it is shared via the Network File System. In the case of our example, we know the sdb1 device is formatted with the ext4 filesystem, therefore our fstab entry becomes:
When to use none or none in fstab?
In each fstab entry, the second field specifies the mountpoint for the filesystem: what directory in the system should be used to access its content. This should be always provided except if the block device we are referencing it’s used as swap. In that case “none” should be used.