Veritas™ Volume Manager Administrator's Guide
- Understanding Veritas Volume Manager
- VxVM and the operating system
- How VxVM handles storage management
- Volume layouts in VxVM
- Online relayout
- Volume resynchronization
- Dirty region logging
- Volume snapshots
- FastResync
- Provisioning new usable storage
- Administering disks
- Disk devices
- Discovering and configuring newly added disk devices
- Discovering disks and dynamically adding disk arrays
- How to administer the Device Discovery Layer
- Changing the disk-naming scheme
- Adding a disk to VxVM
- Rootability
- Displaying disk information
- Removing disks
- Removing and replacing disks
- Administering Dynamic Multi-Pathing
- How DMP works
- Administering DMP using vxdmpadm
- Gathering and displaying I/O statistics
- Specifying the I/O policy
- Online dynamic reconfiguration
- Reconfiguring a LUN online that is under DMP control
- Creating and administering disk groups
- About disk groups
- Displaying disk group information
- Creating a disk group
- Importing a disk group
- Moving disk groups between systems
- Handling cloned disks with duplicated identifiers
- Handling conflicting configuration copies
- Reorganizing the contents of disk groups
- Destroying a disk group
- Creating and administering subdisks and plexes
- Displaying plex information
- Reattaching plexes
- Creating volumes
- Types of volume layouts
- Creating a volume
- Using vxassist
- Creating a volume on specific disks
- Creating a mirrored volume
- Creating a striped volume
- Creating a volume using vxmake
- Initializing and starting a volume
- Using rules and persistent attributes to make volume allocation more efficient
- Administering volumes
- Displaying volume information
- Monitoring and controlling tasks
- Reclamation of storage on thin reclamation arrays
- Stopping a volume
- Resizing a volume
- Adding a mirror to a volume
- Preparing a volume for DRL and instant snapshots
- Adding traditional DRL logging to a mirrored volume
- Enabling FastResync on a volume
- Performing online relayout
- Adding a RAID-5 log
- Creating and administering volume sets
- Configuring off-host processing
- Administering hot-relocation
- How hot-relocation works
- Moving relocated subdisks
- Administering cluster functionality (CVM)
- Overview of clustering
- Multiple host failover configurations
- CVM initialization and configuration
- Dirty region logging in cluster environments
- Administering VxVM in cluster environments
- Changing the CVM master manually
- Importing disk groups as shared
- Administering sites and remote mirrors
- About sites and remote mirrors
- Fire drill - testing the configuration
- Changing the site name
- Administering the Remote Mirror configuration
- Failure and recovery scenarios
- Performance monitoring and tuning
- Appendix A. Using Veritas Volume Manager commands
- Appendix B. Configuring Veritas Volume Manager
Corruption of disk group configuration
If vxdg import is used with -C (clears locks) and/or -f (forces import) to import a disk group that is still in use from another host, disk group configuration corruption is likely to occur. Volume content corruption is also likely if a file system or database is started on the imported volumes before the other host crashes or shuts down.
If this kind of corruption occurs, your configuration must typically be rebuilt from scratch and all data be restored from a backup. There are typically numerous configuration copies for each disk group, but corruption nearly always affects all configuration copies, so redundancy does not help in this case.
As long as the configuration backup daemon, vxconfigbackupd, is running, VxVM will backup configurations whenever the configuration is changed. By default, backups are stored in /etc/vx/cbr/bk. You may also manually backup the configuration using the vxconfigbackup utility. The configuration can be rebuilt using the vxrestore utility.
See the vxconfigbackup, vxconfigbackupd, vxconfigrestore man pages.
Disk group configuration corruption usually shows up as missing or duplicate records in the configuration databases. This can result in a variety of vxconfigd error messages
VxVM vxconfigd ERROR V-5-1-569 Disk group group,Disk disk: Cannot auto-import group: reason
where the reason can describe errors such as:
Association not resolved Association count is incorrect Duplicate record in configuration Configuration records are inconsistent
These errors are typically reported in association with specific disk group configuration copies, but usually apply to all copies. The following is usually displayed along with the error:
Disk group has no valid configuration copies
If you use the Veritas Cluster Server product, all disk group failover issues can be managed correctly. VCS includes a high availability monitor and includes failover scripts for VxVM, VxFS, and for several popular databases.
The -t option to vxdg prevents automatic re-imports on reboot and is necessary when used with a host monitor (such as VCS) that controls imports itself, rather than relying on automatic imports by Veritas Volume Manager.
See the Veritas Volume Manager Troubleshooting Guide.