Creating the free and reserved pools of volumes

The IBM System Storage Support for Microsoft Volume Shadow Copy Service and Virtual Disk Service software maintains a free and a reserved pool of volumes. Because these objects do not exist on the Lenovo Storage V7000, the free and reserved pool of volumes are implemented as virtual host systems. You must define these two virtual host systems on the Lenovo Storage V7000.

When a shadow copy is created, the IBM System Storage Support for Microsoft Volume Shadow Copy Service and Virtual Disk Service software selects a volume in the free pool, assigns it to the reserved pool, and then removes it from the free pool. This protects the volume from being overwritten by other Volume Shadow Copy Service users.

To successfully carry out a Volume Shadow Copy Service operation, there must be enough volumes mapped to the free pool. The volumes must be the same size as the source volumes.

Use the management GUI or the Lenovo Storage V7000 command-line interface (CLI) to carry out the following steps:

  1. Create a host for the free pool of volumes.
    • You can use the default name VSS_FREE or specify a different name.
    • Associate the host with the worldwide port name (WWPN) 5000000000000000 (15 zeroes).
  2. Create a virtual host for the reserved pool of volumes.
    • You can use the default name VSS_RESERVED or specify a different name.
    • Associate the host with the WWPN 5000000000000001 (14 zeroes).
  3. Map the logical units (volumes) to the free pool of volumes.
    Restriction: The volumes cannot be mapped to any other hosts.
    • If you already have volumes created for the free pool of volumes, you must assign the volumes to the free pool.
  4. Create host mappings between the volumes selected in step 3 and the VSS_FREE host to add the volumes to the free pool.
    Alternatively, you can use the ibmvcfg add command to add volumes to the free pool.
  5. Verify that the volumes have been mapped.

If you do not use the default WWPNs 5000000000000000 and 5000000000000001, you must configure the IBM System Storage Support for Microsoft Volume Shadow Copy Service and Virtual Disk Service software with the WWPNs.