Running The Trust Command - HP MSA 2040 Troubleshooting Manual

NOTE:
The trust command is used as a last step in a disaster recovery situation, and must be
performed only by someone who knows how to use the trust command and has experience
with Vdisk or disk group configurations and reviewing array logs.
If you are not sure to take the corrective action, contact the Hewlett Packard Enterprise
Support Center for further assistance.

Running the trust command

1. Disable the background scrub. For more information, see CLI User Guide.
2. Identify the cause for the Vdisk or disk group going Quarantined offline or Offline.
3. If an external issue, such as power failure or cable failures or disconnections, caused the
Vdisk or disk group to go Quarantined offline or Offline, fix the external issue. Return the
array to a stable state before continuing to the next step.
4. Determine the drives to be used with the trust command.
If the Vdisk or disk group went Quarantined offline or Offline during a reconstruction,
determine if the drive that caused the Vdisk or disk group to go Quarantined offline or
Offline went Leftover or Failed.
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If the Vdisk or disk group went Quarantined offline or Offline, but not during a
reconstruction, note the drives that caused the Vdisk or disk group to most recently go
Fault Tolerant with a down disk, Critical, and Quarantined offline or Offline. Unseat
the drives that caused the Vdisk or disk group to go Fault Tolerant with a down disk
and Critical.
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If the drive went Leftover and was not experiencing UREs, SMART issues, or other
errors, unseat the spare drives that were brought into the Vdisk or disk group for
reconstruction.
If the drive Failed or went Leftover due to UREs, SMART issues, or other errors
(from now on known simply as the failed drive), determine whether to use the
partially reconstructed target drive rather than the failed drive. For example, if the
reconstruction is mostly done and the failed drive had numerous errors before
failing, you may recover more data using the partially reconstructed drive. Even
though the data is not complete, because the failed drive may not stay up long
enough to be useful. To determine how far the reconstruction has gone, consider
the size of the Vdisk or disk group, the type of drives, and review the array logs to
determine when the reconstruction started and the time a drive failure occurred.
Since using the trust command can irrevocably destroy data, or if you cannot
determine the correct drives to use, or the status of the reconstruct, contact Hewlett
Packard Enterprise Support Center for assistance.
For a RAID-5 Vdisk or disk group, unseat the first Failed or Leftover drive that led
to the Vdisk or disk group going Quarantined offline or Offline, according to the
logs.
For a RAID-6 Vdisk or disk group, unseat the first two Failed or Leftover drives
that led to the Vdisk or disk group going Quarantined offline or Offline, according
to the logs.
For a RAID-50 Vdisk or disk group, if you know the sub-Vdisk details, unseat the
first Failed or Leftover drive that led to the RAID-5 sub- Vdisk failing, according
Using the Trust Command 27