Using The Trust Command - HP MSA 2040 Troubleshooting Manual

NOTE:
Avoid unnecessary chassis replacement. Other than a mechanical failure, it is rare to have
a chassis or midplane issue requiring replacement.
A FRU is any HPE orderable replacement part.
For information on replacing the Chassis, see HPE Chassis Replacement Instructions Guide on
the Hewlett Packard Enterprise Support Center website.

Using the Trust Command

The trust command re-synchronizes time and date metadata on the drives, making Leftover
or Failed drives that were once members of the Vdisk or disk group, active members of the
Vdisk or disk group again. Use the trust command when a Vdisk or disk group is Offline and
there is no data backup, or to recover the current data on a Vdisk or disk group. In these cases,
the trust command works, only if the drives continue to operate.
Use the trust command as follows:
1. After the trusted Vdisk or disk group is back online, back up the Vdisk or disk group and
verify that the data is valid.
2. Delete the trusted Vdisk or disk group, replace any drive that was a member of the trusted
Vdisk or disk group that Failed or went Leftover because of Unrecoverable Read Errors
(UREs), SMART issues, or other errors, and then create a Vdisk or disk group.
3. Restore data from a valid backup to the new Vdisk or disk group.
CAUTION:
The trust command can cause permanent data loss and unstable Vdisk or disk group
operation.
Using the trust command on a Vdisk or disk group is a disaster-recovery measure only;
the Vdisk or disk group has no tolerance for any additional failures and must never be put
back into a production environment.
After the trust command is issued on a Vdisk or disk group, additional disaster recovery
troubleshooting steps are limited.
The trust command must be used only if the Vdisk or disk group has an Offline status;
the trust command will not run on a Vdisk or disk group with another status.
Do not use the trust command when the storage system is unstable, during power events,
or events where enclosures or drives are added or removed unintentionally.
Do not attempt to run the trust command on a Vdisk or disk group that is Quarantined
critical, Quarantined offline, or Quarantined with down drives.
When the Vdisk or disk group is Offline:
◦
Never update the controller-module, expansion-module, or drive firmware.
◦
Never clear unwritten cache data.
You cannot use the trust command on a Vdisk or disk group that went Offline during Vdisk
or disk group expansion.
You cannot use the trust command on a Vdisk or disk group with a Critical status. Instead,
add spares and let the system reconstruct the Vdisk or disk group.
26 Troubleshooting HPE MSA 1040/2040 Storage