SnapProtect - Hitachi Data Systems (HDS) – Advanced

Reusing Deleted Shadow Image (Applicable for HDvM Engine)

You can reuse a deleted Shadow Image by creating the CVHDS_USE_DELETED_SHADOWIMAGE additional settings during one of the following scenarios:

  • When the expected changes to the source volume are less than 50% between the old and new Shadow Image.
  • When you decide to use a spool copy.

Use the following steps to setthe CVHDS_USE_DELETED_SHADOWIMAGE additional settings:

  1. From the CommCell Browser, navigate to Client Computers.
  2. Right-click the <Client Computer>, click Properties.
  3. In the Client Computer Properties dialog box, click Properties.
  4. In the Advanced Client Properties dialog box, click the Additional Settings tab and click Add .
  5. In the Add Additional Settings on Windows Client dialog box, specify the following:
    1. In the Name box, type CVHDS_USE_DELETED_SHADOWIMAGE.
    2. From the Category list, select iDataAgent.
    3. From the Type list, select INTEGER.
    4. In the Value box, type 1 to reuse a deleted Shadow Image.
    5. Click OK.

      The additional settings created will be displayed under Name field.

  6. Click OK to close Advanced Client Properties dialog box.
  7. Click OK to close Client Computer Properties dialog box.

HostGroup for GUI Mount (Applicable for CCI engine)

You can specify the hostgroup to which SVOLs are presented during a GUI mount to a non source/proxy host using additional settings sCVHDSHostGroupToMapSvols_<serial#>.

The Hostgroup specified in snap config HostGroup to which SVOLs will be presented is used to map snaps during a job either to the source or to the proxy host. This value will not be used during GUI mount to a non source/proxy host.

Use the following steps to set the sCVHDSHostGroupToMapSvols_<serial#>:

  1. From the CommCell Browser, navigate to Client Computers.
  2. Right-click the <Client Computer>, click Properties.
  3. In the Client Computer Properties dialog box, click Properties.
  4. In the Advanced Client Properties dialog box, click the Additional Settings tab and click Add .
  5. In the Add Additional Settings on Windows Client dialog box, specify the following:
    1. In the Name box, type sCVHDSHostGroupToMapSvols_<serial#>.
    2. From the Category list, select iDataAgent.
    3. From the Type list, select STRING.
    4. In the Value box, type the host group name.
    5. Click OK.

      The additional settings created will be displayed under Name field.

    6. Click OK to close Advanced Client Properties dialog box.
    7. Click OK to close Client Computer Properties dialog box.

Verify if Client Setup is Correct for HDS CCI Engine

  1. Create a horcm instance with the command device to test raidcom commands.
  2. Start the horcm instance. If the instance fails to start, look at the horcm logs for more details.
  3. After horcm instance started successfully, try the following raidcom commands

    raidcom -login –IM<inst no> -s <serial>

    Use your horcm instance number for <inst> and array’s serial number for <serial>.

    raidcom lock resource -resource_name meta_resource –IM<inst no>
    -s <serial>

    raidcom unlock resource -resource_name meta_resource –IM<inst no>
    -s <serial>

    If any of the above commands fail, check the horcm logs for more detail. Also make sure user privileges and command device properties are set correctly.
  4. Only on windows, verify if

raidscan –x findcmddev 1-100

returns a valid command device for your array. If the command device is not within this range, set nCVHDSFindCmdDevMaxDeviceNumber in iDataSection to 160. Verify that the command returns the correct command device.