Dequarantine - HP P2000 G3 Cli Reference Manual

dequarantine

Description Removes a vdisk from quarantine.
CAUTION:
manually remove a vdisk from quarantine. The dequarantine command should only be used as
part of the emergency procedure to attempt to recover data and is normally followed by use of the
CLI trust command. If a vdisk is manually dequarantined and does not have enough disks to
continue operation, its status will change to OFFL and its data may or may not be recoverable
through use of the trust command. Consult the online troubleshooting guide at
https://www.hp.com/go/p2000/troubleshooting. Also, see the help for the trust command.
To continue operation (that is, not go to quarantined status), a RAID-3 or RAID-5 vdisk can have only
one inaccessible disk; a RAID-6 vdisk can have only one or two inaccessible disks; a RAID- 1 0 or
RAID-50 vdisk can have only one inaccessible disk per sub-vdisk. For example, a 16-disk RAID- 1 0
vdisk can remain online (critical) with 8 inaccessible disks if one disk per mirror is inaccessible.
The system will automatically quarantine a vdisk having a fault-tolerant RAID level if one or more of
its disks becomes inaccessible, or to prevent invalid ("stale") data that may exist in the controller from
being written to the vdisk. Quarantine will not occur if a known-failed disk becomes inaccessible or
if a disk becomes inaccessible after failover or recovery. The system will automatically quarantine an
NRAID or RAID-0 vdisk to prevent invalid data from being written to the vdisk. If quarantine occurs
because of an inaccessible disk, event 172 is logged. If quarantine occurs to prevent writing invalid
data, event 485 is logged.
Examples of when quarantine can occur are:
• At system power-up, a vdisk has fewer disks online than at the previous power-up. This may
happen because a disk is slow to spin up or because an enclosure is not powered up. The vdisk
will be automatically dequarantined if the inaccessible disks come online and the vdisk status
becomes FTOL (fault tolerant and online), or if after 60 seconds the vdisk status is QTCR or
QTDN.
• During system operation, a vdisk loses redundancy plus one more disk; for example, three disks
are inaccessible in a RAID-6 vdisk or two disks are inaccessible for other fault-tolerant RAID
levels. The vdisk will be automatically dequarantined if after 60 seconds the vdisk status is FTOL,
FTDN, or CRIT.
Quarantine isolates the vdisk from host access and prevents the system from changing the vdisk
status to OFFL (offline). The number of inaccessible disks determines the quarantine status; from least
to most severe:
• QTDN (quarantined with a down disk): The RAID-6 vdisk has one inaccessible disk. The vdisk is
fault tolerant but degraded. If the inaccessible disks come online or if after 60 seconds from
being quarantined the vdisk is QTCR or QTDN, the vdisk is automatically dequarantined.
• QTCR (quarantined critical): The vdisk is critical with at least one inaccessible disk. For example,
two disks are inaccessible in a RAID-6 vdisk or one disk is inaccessible for other fault-tolerant
RAID levels. If the inaccessible disks come online or if after 60 seconds from being quarantined
the vdisk is QTCR or QTDN, the vdisk is automatically dequarantined.
• QTOF (quarantined offline): The vdisk is offline with multiple inaccessible disks causing user data
to be incomplete, or is an NRAID or RAID-0 vdisk.
Carefully read this topic to determine whether to use the dequarantine command to
HP P2000 G3 MSA System CLI Reference Guide 91