Dequarantine - HP P2000 Reference Manual

dequarantine

Description Removes a vdisk from quarantine.
A vdisk having a fault-tolerant RAID level becomes quarantined if at least one of its disks is detected
as missing after the storage system is powered up or while it is operating. Quarantine does not occur
for NRAID or RAID-0 vdisks; if known-failed disks are missing; or if disks are missing after failover or
recovery.
Quarantine isolates the vdisk from host access, and prevents the system from changing the vdisk
status to OFFL (offline). The number of missing disks determines the quarantine status; from least to
most severe:
• QTDN: Quarantined with down disks. At least one disk is missing; however, the vdisk could be
accessed and would be fault tolerant. For instance, one disk is missing from a RAID-6.
• QTCR: Quarantined critical. At least one disk is missing; however, the vdisk could be accessed.
For instance, one disk is missing from a mirror or RAID-5.
• QTOF: Quarantined offline. Multiple disks are missing and user data is incomplete.
When a vdisk is quarantined, its disks are write-locked, its volumes become inaccessible, and it is
not available to hosts until it is dequarantined. If there are interdependencies between the
quarantined vdisk's volumes and volumes in other vdisks, quarantine may temporarily impact
operation of those other volumes. For example, if the quarantined vdisk contains the snap pool used
for snapshot, volume-copy, or replication operations, quarantine may temporarily cause the
associated master volume to go offline; a volume-copy or replication operation can also be
disrupted if an associated volume (snap pool, source volume, or destination volume) goes offline.
Depending on the operation, the length of the outage, and the settings associated with the
operation, the operation may resume automatically resume when the vdisk is dequarantined or may
require manual intervention. A vdisk can remain quarantined indefinitely without risk of data loss.
Examples of when quarantine might 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 a drive enclosure is not powered up. The
vdisk will be automatically dequarantined if the missing 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.
• A vdisk that is not running I/O loses redundancy plus one more disk. The vdisk will be
automatically dequarantined if the missing disks come online and the vdisk status becomes
FTOL, or if after 60 seconds the vdisk status is QTCR or QTDN.
• A vdisk running I/O loses redundancy plus one more disk. The vdisk will be automatically
dequarantined if the vdisk's status is QTCR or QTDN.
A vdisk is dequarantined when it is brought back online, which can occur in three ways:
• If the missing disks come online, making the vdisk FTOL, the vdisk is automatically
dequarantined.
• If after 60 seconds from being quarantined the vdisk is QTCR or QTDN, the vdisk is automatically
dequarantined. The missing disks are marked as failed and the vdisk status changes to CRIT
(critical) or FTDN (fault tolerant with down disks).
• The dequarantine command is used to manually dequarantine the vdisk. If the missing disks
later come online, they are marked as LEFTOVR (leftover).
A quarantined vdisk can be fully recovered if the missing disks are restored. Make sure that all disks
are properly seated, that no disks have been inadvertently removed, and that no cables have been
unplugged. Sometimes not all disks in the vdisk power up. Check that all enclosures have restarted
after a power failure. If these problems are found and then fixed, the vdisk recovers and no data is
lost.
86 Alphabetical list of commands