Veritas Volume Manager 5.0 Troubleshooting Guide Guide (September 2006)

48 Backing up and restoring disk group configurations
Backing up a disk group configuration
Invalid block number
Invalid magic number
If VxVM cannot update a disk group’s configuration because of disk errors, it disables the
disk group and displays the following error:
VxVM vxconfigd ERROR V-5-1-123 Disk group group: Disabled by errors
If such errors occur, you can restore the disk group configuration from a backup after you
have corrected any underlying problem such as failed or disconnected hardware.
Configuration data from a backup allows you to reinstall the private region headers of
VxVM disks in a disk group whose headers have become damaged, to recreate a corrupted
disk group configuration, or to recreate a disk group and the VxVM objects within it. You
can also use the configuration data to recreate a disk group on another system if the
original system is not available.
Note: Restoration of a disk group configuration requires that the same physical disks are
used as were configured in the disk group when the backup was taken.
The following sections describe how to back up and restore disk group configurations.
Backing up a disk group configuration
VxVM uses the disk group configuration daemon to monitor the configuration of disk
groups, and to back up the configuration whenever it is changed. By default, the five most
recent backups are preserved. If required, you can also back up a disk group configuration
by running the
vxconfigbackup command.
The following table describes the files that record disk group configuration information:
Here diskgroup is the name of the disk group, and dgid is the disk group ID. If a disk
group is to be recreated on another system, copy these files to that system.
Table 5-1 Files that record disk group configuration
Backup files Description
/etc/vx/cbr/bk/diskgroup.dgid/dgid.dginfo Disk group information.
/etc/vx/cbr/bk/diskgroup.dgid/dgid .diskinfo Disk attributes.
/etc/vx/cbr/bk/diskgroup.dgid/dgid .binconfig Binary configuration copy.
/etc/vx/cbr/bk/diskgroup.dgid/dgid.cfgrec Configuration records in
vxprint -m format.