Displaying extended device attributes

Device Discovery Layer (DDL) extended attributes are attributes or flags corresponding to a Veritas Volume Manager (VxVM) or Dynamic Multi-Pathing (DMP) LUN or disk and that are discovered by DDL. These attributes identify a LUN to a specific hardware category.

Table: Categories for extended attributes describes the list of categories.

Table: Categories for extended attributes

Category

Description

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 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 through 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               DDL_DEVICE_ATTR  VID        
tagmastore-usp0_0a7a std fc RAID_5    HITACHI      
tagmastore-usp0_0a7b std fc RAID_5    HITACHI      
tagmastore-usp0_0a78 std fc RAID_5    HITACHI
tagmastore-usp0_0a79 std fc RAID_5    HITACHI
tagmastore-usp0_065a hdprclm fc       HITACHI
tagmastore-usp0_065b hdprclm fc       HITACHI
tagmastore-usp0_065c hdprclm fc       HITACHI
tagmastore-usp0_065d hdprclm fc       HITACHI

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:

http://www.symantec.com/docs/TECH211575

Note:

DMP does not support Extended Attributes for LUNs that are controlled by the native multi-pathing driver.