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
Specifying storage for version 20 DCO plexes
If you move the disks that contain volumes and their snapshots into different disk groups, you must ensure that the disks that contain their DCO plexes can accompany them. You can use storage attributes to specify which disks to use for the DCO plexes. (If you do not want to use dirty region logging (DRL) with a volume, you can specify the same disks as those on which the volume is configured, assuming that space is available on the disks). For example, to add a DCO object and mirrored DCO volume with plexes on disk05 and disk06 to the volume, myvol, use the following command:
# vxsnap -g mydg prepare myvol ndcomirs=2 alloc=disk05,disk06
To view the details of the DCO object and DCO volume that are associated with a volume, use the vxprint command. The following is example vxprint -vh output for the volume named vol1 (the TUTIL0 and PUTIL0 columns are omitted for clarity):
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE ... v vol1 fsgen ENABLED 1024 - ACTIVE pl vol1-01 vol1 ENABLED 1024 - ACTIVE sd disk01-01 vol1-01 ENABLED 1024 0 - pl foo-02 vol1 ENABLED 1024 - ACTIVE sd disk02-01 vol1-02 ENABLED 1024 0 - dc vol1_dco vol1 - - - - v vol1_dcl gen ENABLED 132 - ACTIVE pl vol1_dcl-01 vol1_dcl ENABLED 132 - ACTIVE sd disk03-01 vol1_dcl-01 ENABLED 132 0 - pl vol1_dcl-02 vol1_dcl ENABLED 132 - ACTIVE sd disk04-01 vol1_dcl-02 ENABLED 132 0 -
In this output, the DCO object is shown as vol1_dco, and the DCO volume as vol1_dcl with 2 plexes, vol1_dcl-01 and vol1_dcl-02.
If you need to relocate DCO plexes to different disks, you can use the vxassist move command. For example, the following command moves the plexes of the DCO volume, vol1_dcl, for volume vol1 from disk03 and disk04 to disk07 and disk08.
Note:
The ! character is a special character in some shells. The following example shows how to escape it in a bash shell.
# vxassist -g mydg move vol1_dcl \!disk03 \!disk04 disk07 disk08
See the vxassist(1M) manual page.
See the vxsnap(1M) manual page.
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