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Storage Foundation 7.4.1 Administrator's Guide - Linux

Last Published: 2019-09-25

Product(s): InfoScale & Storage Foundation (7.4.1)

Platform: Linux

Identifying thin and thin reclamation LUNs

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 thinrclm.

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

To identify all of the thin or thinrclm LUNs that are locally 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.