CLI Guide

status becomes FTOL (fault tolerant and online), or if after 60 seconds the disk group status is
QTCR or QTDN.
● During system operation, a disk group loses redundancy plus one more disk. For example, three
disks are inaccessible in a RAID-6 disk group or two disks are inaccessible for other fault-tolerant
RAID levels. The disk group will be automatically dequarantined if after 60 seconds the disk group
status is FTOL, FTDN, or CRIT.
Quarantine isolates the disk group from host access and prevents the system from changing the disk
group 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 disk group has one inaccessible disk. The
disk group is fault tolerant but degraded. If the inaccessible disks come online or if after 60
seconds from being quarantined the disk group is QTCR or QTDN, the disk group is automatically
dequarantined.
● QTCR (quarantined critical): The disk group is critical with at least one inaccessible disk. For
example, two disks are inaccessible in a RAID-6 disk group 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 disk group is QTCR or QTDN, the disk group is automatically dequarantined.
● QTOF (quarantined offline): The disk group is offline with multiple inaccessible disks causing user
data to be incomplete, or is an NRAID or RAID-0 disk group.
When a disk group is quarantined, its disks become write-locked, its volumes become inaccessible,
and it is not available to hosts until it is dequarantined. If there are interdependencies between
the quarantined disk group’s volumes and volumes in other disk groups, quarantine may temporarily
impact operation of those other volumes.
Depending on the operation, the length of the outage, and the settings associated with the operation,
the operation may automatically resume when the disk group is dequarantined or may require manual
intervention. A disk group can remain quarantined indefinitely without risk of data loss.
A disk group is dequarantined when it is brought back online, which can occur in three ways:
● If the inaccessible disks come online, making the disk group FTOL, the disk group is automatically
dequarantined.
● If after 60 seconds from being quarantined the disk group is QTCR or QTDN, the disk group is
automatically dequarantined. The inaccessible disks are marked as failed and the disk group status
changes to CRIT (critical) or FTDN (fault tolerant with a down disk). If the inaccessible disks later
come online, they are marked as LEFTOVR (leftover).
● The dequarantine command is used to manually dequarantine the disk group. If the
inaccessible disks later come online, they are marked as LEFTOVR (leftover). If event 172 was
logged, do not use the dequarantine command. Instead follow the event’s recommended-
action text. If event 485 was logged, use the dequarantine command only as specified by the
event’s recommended-action text to avoid data corruption or loss.
When a disk group is dequarantined, event 173 is logged.
A quarantined disk group can be fully recovered if the inaccessible 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 disk group power up. Check that all enclosures have
restarted after a power failure. If these problems are found and then fixed, the disk group recovers
and no data is lost.
If the inaccessible disks cannot be restored (for example, they failed), and the disk group’s status is
FTDN or CRIT, and compatible spares are available to replace the inaccessible disks, reconstruction
will automatically begin.
If a replacement disk (reconstruct target) is inaccessible at power up, the disk group becomes
quarantined. When the disk is found, the disk group is dequarantined and reconstruction starts. If
reconstruction was in process, it continues where it left off.
NOTE:
The only commands allowed for a quarantined disk group are dequarantine and delete
vdisks and remove disk-groups. If you delete a quarantined disk group and its inaccessible disks
later come online, the disk group will reappear as quarantined or offline and you must delete it
again (to clear those disks).
This command has a confirmation prompt in interactive console mode.
Minimum role
manage
78 Alphabetical list of commands