The preparation for backing up file systems begins with planning, which is described in Chapter 46, Backing Up and Restoring File Systems (Overview) and includes choosing the following:
The file systems to back up
The type of backup (full or incremental) to perform
A backup schedule
A tape drive
For more information, see Chapter 46, Backing Up and Restoring File Systems (Overview).
This section describes two other tasks you might need to perform before you back up file systems:
Finding the names of file systems to back up
Determining the number of tapes that are needed for a full backup
Display the contents of the /etc/vfstab file.
$ more /etc/vfstab |
Look in the mount point column for the name of the file system.
Use the directory name listed in the mount point column when you back up the file system.
In this example, the file systems to be backed up are root (/), /usr, /datab, and /export/home.
$ more /etc/vfstab #device device mount FS fsck mount mount #to mount to fsck point type pass at boot options # fd - /dev/fd fd - no - /proc - /proc proc - no - /dev/dsk/c0t0d0s1 - - swap - no - /dev/dsk/c0t0d0s0 /dev/rdsk/c0t0d0s0 / ufs 1 no - /dev/dsk/c0t0d0s6 /dev/rdsk/c0t0d0s6 /usr ufs 1 no - /dev/dsk/c0t0d0s5 /dev/rdsk/c0t0d0s5 /datab ufs 2 yes - /dev/dsk/c0t0d0s7 /dev/rdsk/c0t0d0s7 /export/home ufs 2 yes - swap - /tmp tmpfs - yes - |
Become superuser or assume an equivalent role.
Estimate the size of the backup in bytes.
# ufsdump S file-system |
The S option displays the estimated number of bytes that are needed to do the backup.
Divide the estimated size by the capacity of the tape to see how many tapes you need.
For a list of tape capacities, see Table 46–5.
In this example, the file system of 489,472 bytes easily fits on a 150-Mbyte tape.
# ufsdump S /export/home 489472 |