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
Rule file format
When you create rules, you do not define them in the /etc/default/vxassist
file. You create the rules in another file and add the path information to /etc/default/vxassist
. By default, a rule file is loaded from /etc/default/vxsf_rules
. You can override this location in /etc/default/vxassist
with the attribute rulefile=/path/rule_file_name. You can also specify additional rule files on the command line.
A rule file uses the following conventions:
Blank lines are ignored.
Use the pound sign, #, to begin a comment.
Use C language style quoting for the strings that may include embedded spaces, new lines, or tabs. For example, use quotes around the text for the description attribute.
Separate tokens with a space.
Use braces for a rule that is longer than one line.
Within the rule file, a volume allocation rule has the following format:
volume rule rulename vxassist_attributes
This syntax defines a rule named rulename which is a short-hand for the listed vxassist attributes. Rules can reference other rules using an attribute of rule=rulename[,rulename,...], which adds all the attributes from that rule into the rule currently being defined. The attributes you specify in a rule definition override any conflicting attributes that are in a rule that you specify by reference. You can add a description to a rule with the attribute description=description_text.
The following is a basic rule file. The first rule in the file, base, defines the logtype and persist attributes. The remaining rules in the file - tier0, tier1, and tier2 - reference this rule and also define their own tier-specific attributes. Referencing a rule lets you define attributes in one place and reuse them in other rules.
# Create tier 1 volumes mirrored between disk arrays, tier 0 on SSD, # and tier 2 as unmirrored. Always use FMR DCO objects. volume rule base { logtype=dco persist=yes } volume rule tier0 { rule=base mediatype:ssd tier=tier0 } volume rule tier1 { rule=base mirror=enclosure tier=tier1 } volume rule tier2 { rule=base tier=tier2 }
The following rule file contains a more complex definition which runs across several lines.
volume rule appXdb_storage { description="Create storage for the database of Application X" rule=base siteconsistent=yes mirror=enclosure }
By default, a rule file is loaded from /etc/default/vxsf_rules
. You can override this location in /etc/default/vxassist
. You can also specify additional rule files on the command line.