HP StorageWorks 2000 Series Reference Manual page 213

This section describes recovering data from a virtual disk that is quarantined or
offline (failed).
The quarantine icon
quarantined because not all of its drives were detected after a restart or rescan.
For information about when and how you can recover data from a quarantined
virtual disk, see"Removing a Virtual Disk From Quarantine" on page 75.
If a virtual disk appears to be down or offline (not quarantined) and its drives are
labeled "Leftover," use the Trust Virtual Disk function to recover the virtual disk.
The Trust Virtual Disk function brings a virtual disk back online by ignoring
metadata that indicates the drives might not form a coherent virtual disk. This
function can force an offline virtual disk to be critical or fault tolerant, or a critical
virtual disk to be fault tolerant. You might need to do this when:
A drive was removed or was marked as failed in a virtual disk due to
circumstances you have corrected (such as accidentally removing the wrong
disk). In this case, one or more drives in a virtual disk can start up more slowly,
or might have been powered on after the rest of the drives in the virtual disk.
This causes the date and time stamps to differ, which the storage system
interprets as a problem. Also see "Removing a Virtual Disk From Quarantine" on
page 213.
A virtual disk is offline because a drive is failing, you have no data backup, and
you want to try to recover the data from the virtual disk. In this case, the Trust
Virtual Disk function might work, but only as long as the failing drive continues
to operate.
If used improperly, the Trust Virtual Disk feature can cause unstable
operation and data loss. Only use this function for disaster recovery purposes and
when advised to do so by a service technician. The virtual disk has no tolerance for
any additional failures.
indicates that a previously fault-tolerant virtual disk is