Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

170 Creating and administering disk groups
Handling disks with duplicated identifiers
Enabling configuration database copies on tagged disks
In this example, the following commands have been used to tag some of the disks in an
Hitachi TagmaStore array:
# vxdisk settag TagmaStore-USP0_28 t1=v1
# vxdisk settag TagmaStore-USP0_28 t2=v2
# vxdisk settag TagmaStore-USP0_24 t2=v2
# vxdisk settag TagmaStore-USP0_25 t1=v1
These tags can be viewed by using the vxdisk listtag command:
# vxdisk listtag
DEVICE NAME VALUE
TagmaStore-USP0_24 t2 v2
TagmaStore-USP0_25 t1 v1
TagmaStore-USP0_28 t1 v1
TagmaStore-USP0_28 t2 v2
The following command ensures that configuration database copies and kernel log copies
are maintained for all disks in the disk group mydg that are tagged as t1:
# vxdg -g mydg set tagmeta=on tag=t1 nconfig=all nlog=all
The disks for which such metadata is maintained can be seen by using this command:
# vxdisk -o alldgs list
DEVICE TYPE DISK GROUP STATUS
TagmaStore-USP0_10 auto:cdsdisk - - online
TagmaStore-USP0_24 auto:cdsdisk mydg02 mydg online
TagmaStore-USP0_25 auto:cdsdisk mydg03 mydg online tagmeta
TagmaStore-USP0_26 auto:cdsdisk - - online
TagmaStore-USP0_27 auto:cdsdisk - - online
TagmaStore-USP0_28 auto:cdsdisk mydg01 mydg online tagmeta
Alternatively, the following command can be used to ensure that a copy of the metadata is
kept with a disk:
# vxdisk set TagmaStore-USP0_25 keepmeta=always
# vxdisk -o alldgs list
DEVICE TYPE DISK GROUP STATUS
TagmaStore-USP0_10 auto:cdsdisk - - online
TagmaStore-USP0_22 auto:cdsdisk - - online
TagmaStore-USP0_23 auto:cdsdisk - - online
TagmaStore-USP0_24 auto:cdsdisk mydg02 mydg online
TagmaStore-USP0_25 auto:cdsdisk mydg03 mydg online keepmeta
TagmaStore-USP0_28 auto:cdsdisk mydg01 mydg online