HP-UX System Administrator's Guide: Routine Management Tasks

Backing Up If You Are Using LVM
If you are running LVM, you must maintain the backup configuration files for each
volume group. After making changes to the configuration of the disks or the logical
volumes within a given volume group, the vgcfgbackup command is run automatically
to record the group’s configuration (vgcfgbackup saves the configuration of each
volume group in /etc/lvmconf/volume_group_name.conf).
To ensure recovery of LVM information following disk corruption, you must back up
both the /dev and /usr directories. Include the /usr directory in the root volume
group during your backup. If, however, the /usr directory was not originally part of
the root volume group, you can still create a new logical volume in the root volume
group and move the /usr directory within it.
For information on saving volume group configuration information using
vgcfgbackup, see HP-UX System Administrator’s Guide: Logical Volume Management.
Backing Up Large Files
A large file is defined as one whose size is greater than 2 GB. See the HP-UX Large Files
White Paper Version 1.4 for more information.
Backup Utilities that Support Large Files
The following backup utilities will back up large files.
• dd
• fbackup, frecover
Neither of the preceding commands require any user intervention to backup large files.
Backup Utilities that Do Not (fully) Support Large Files
The following backup utilities do not support large files:
tar
Supports files <8GB in size
cpio
Does not support large files (>2GB) and cannot process cpio archives
containing large files written by pax)
pax Supports files <8GB in size for ustar and cpio formats, (but will
support any size file in pax format).
ftio
Does not support large files (>2GB)
Attempts to back up any files greater than 2 GB using the preceding utilities will fail.
Restoring Large Files
If you use fbackup to back up large files (> 2 GB), then those files can only be restored
on a large file system. For instance, suppose that you back up a file system containing
large files; you cannot restore those files to a file system that is not enabled for large
files.
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