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
Displaying extended device attributes
Device Discovery Layer (DDL) extended attributes are attributes or flags corresponding to a VxVM or DMP LUN or Disk and which are discovered by DDL. These attributes identify a LUN to a specific hardware category.
The list of categories includes:
Hardware RAID types | Displays what kind of Storage RAID Group the LUN belongs to |
Thin Provisioning Discovery and Reclamation | Displays the LUN's thin reclamation abilities |
Device Media Type | Displays the type of media - whether SSD (solid state disk ) |
Storage-based Snapshot/Clone | Displays whether the LUN is a SNAPSHOT or a CLONE of a PRIMARY LUN |
Storage-based replication | Displays if the LUN is part of a replicated group across a remote site |
Transport | Displays what kind of HBA is used to connect to this LUN (FC, SATA, iSCSI) |
Each LUN can have one or more of these attributes discovered during device discovery. ASLs furnish this information to DDL through the property DDL_DEVICE_ATTR. The vxdisk -p list command displays DDL extended attributes. For example, the following command shows attributes of "std", "fc", and "RAID_5" for this LUN:
# vxdisk -p list DISK : tagmastore-usp0_0e18 DISKID : 1253585985.692.rx2600h11 VID : HITACHI UDID : HITACHI%5FOPEN-V%5F02742%5F0E18 REVISION : 5001 PID : OPEN-V PHYS_CTLR_NAME : 0/4/1/1.0x50060e8005274246 LUN_SNO_ORDER : 411 LUN_SERIAL_NO : 0E18 LIBNAME : libvxhdsusp.sl HARDWARE_MIRROR: no DMP_DEVICE : tagmastore-usp0_0e18 DDL_THIN_DISK : thick DDL_DEVICE_ATTR: std fc RAID_5 CAB_SERIAL_NO : 02742 ATYPE : A/A ARRAY_VOLUME_ID: 0E18 ARRAY_PORT_PWWN: 50:06:0e:80:05:27:42:46 ANAME : TagmaStore-USP TRANSPORT : FC
The vxdisk -x attribute -p list command displays the one-line listing for the property list and the attributes. The following example shows two Hitachi LUNs that support Thin Reclamation via the attribute hdprclm
:
# vxdisk -x DDL_DEVICE_ATTR -p list DEVICE DDL_DEVICE_ATTR tagmastore-usp0_0a7a std fc RAID_5 tagmastore-usp0_065a hdprclm fc tagmastore-usp0_065b hdprclm fc
User can specify multiple -x options in the same command to display multiple entries. For example:
# vxdisk -x DDL_DEVICE_ATTR -x VID -p list
DEVICE VID DDL_DEVICE_ATTR tagmastore-usp0_0a7a HITACHI std fc RAID_5 tagmastore-usp0_0a7b HITACHI std fc RAID_5 tagmastore-usp0_0a78 HITACHI std fc RAID_5 tagmastore-usp0_0a79 HITACHI std fc RAID_5 tagmastore-usp0_065a HITACHI hdprclm fc tagmastore-usp0_065b HITACHI hdprclm fc tagmastore-usp0_065c HITACHI hdprclm fc tagmastore-usp0_065d HITACHI hdprclm fc
Use the vxdisk -e list command to show the DLL_DEVICE_ATTR property in the last column named ATTR.
# vxdisk -e list DEVICE TYPE DISK GROUP STATUS OS_NATIVE_NAME ATTR tagmastore-usp0_0a7a auto - - online c10t0d2 std fc RAID_5 tagmastore-usp0_0a7b auto - - online c10t0d3 std fc RAID_5 tagmastore-usp0_0a78 auto - - online c10t0d0 std fc RAID_5 tagmastore-usp0_0655 auto - - online c13t2d7 hdprclm fc tagmastore-usp0_0656 auto - - online c13t3d0 hdprclm fc tagmastore-usp0_0657 auto - - online c13t3d1 hdprclm fc
For a list of ASLs that supports Extended Attributes, and descriptions of these attributes, refer to the hardware compatibility list at the following URL: