Using Dynamic Multi-Pathing (DMP), Storage Foundation automatically discovers thin devices that have been recognized on the host as thin
or thinrclm
. DMP uses the Veritas array support libraries (ASLs) to recognize vendor-specific thin attributes and claim devices accordingly as thin
or thinclm
.
Thin devices that are classified as thin
are capable of thin provisioning. Veritas Thin Reclamation only works on devices with the thinrclm
attribute set. Before performing thin reclamation, determine whether the system recognizes the LUN as a thinrclm
LUN.
To identify devices on a host that are known to have the thin
or thinrclm
attributes, use the vxdisk -o thin list command. The vxdisk -o thin list command also reports on the size of the disk, and the physical space that is allocated on the array.
To identify thin and thinrclm LUNs
thin
or thinrclm
LUNs that are known to a host, use the following command:# vxdisk -o thin list
DEVICE SIZE(MB) PHYS_ALLOC(MB) GROUP TYPE RECLAIM_CMD xiv0_6695 16384 30 dg1 thinrclm WRITE_SAME xiv0_6696 16384 30 dg1 thinrclm WRITE_SAME xiv0_6697 16384 30 dg1 thinrclm WRITE_SAME xiv0_6698 16384 30 dg1 thinrclm WRITE_SAME xiv0_6699 16384 30 dg1 thinrclm WRITE_SAME 3pardata0_5074 2048 2043 vvrdg thinrclm WRITE_SAME 3pardata0_5075 2048 2043 vvrdg thinrclm WRITE_SAME 3pardata0_5076 2048 1166 vvrdg thinrclm WRITE_SAME 3pardata0_5077 2048 2043 vvrdg thinrclm WRITE_SAME 3pardata0_5081 2048 1092 vvrdg thinrclm WRITE_SAME
In the output, the SIZE column shows the size of the disk. The PHYS_ALLOC column shows the physical allocation on the array side. The TYPE indicates whether the array is thin or thinrclm. The RECLAIM_CMD column displays which reclamation method that DMP uses.
See the vxdisk(1m) manual page.