HP StorageWorks 2000 Series Reference Manual page 301

If the status of the virtual disk that originally had
the failed drive status is FATAL FAIL, two or
more drive modules have failed.
The status of the virtual disk that originally had
the failed drive status is DRV ABSENT or
INCOMPLETE. These status indicators only
occur when the enclosure is initially powered up.
DRV ABSENT indicates that one drive module
is bad. INCOMPLETE indicates that two or
more drive modules are bad.
The status of the virtual disk that originally had
the failed drive indicates that the virtual disk is
being rebuilt.
The status of the virtual disk that originally had
the failed drive is DRV FAILED.
All data in the virtual disk is lost. Use the SMU
Trust Virtual Disk function to attempt to bring the
virtual disk back online.
Select Manage > Utilities > Recovery Utilities >
Trust Virtual Disk.
Note: You must be a Diagnostic Manage user to
access the Trust Virtual Disk submenu.
Make sure the enclosures and associated data host
were powered on in this order: first the disk
enclosures, then the controller enclosure, then the
data host. If the power-on sequence was correct,
locate and replace the additional failed drive
modules.
Wait for the virtual disk to complete its operation.
If this status occurs after you replace a defective
drive module with a known good drive module, the
enclosure midplane might have experienced a
failure.
Replace the enclosure.