HP StorageWorks 2000 Series Reference Manual page 214

To enable and use Trust Vdisk:
1. Select Manage > Utilities > Recovery Utilities > Enable Trust Vdisk.
2. Select Enabled.
3. Click Enable/Disable Trust Vdisk.
The option remains enabled until you trust a virtual disk or restart the storage
system.
4. Select Manage > Utilities > Recovery Utilities > Trust Vdisk.
5. Select the virtual disk and click Trust This Vdisk.
6. Back up the data from all the volumes residing on this virtual disk and audit it to
make sure that it is intact.
7. Select Manage > Virtual Disk Config > Verify Virtual Disk. While the verify utility
is running, any new data written to any of the volumes on the virtual disk is written
in a parity-consistent way.
If the virtual disk does not come back online, it might be that too many
drives are offline or the virtual disk might have additional failures on the bus or
enclosure that Trust Vdisk cannot fix.