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:
Each LUN can have one or more of these extended attributes. DDL discovers the extended attributes during device discovery from the array support library (ASL). If Veritas Operations Manager (VOM) is present, DDL can also obtain extended attributes from the VOM Management Server for hosts that are configured as managed hosts.
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 (HCL) at the following URL: