consistent copy
In a Metro or Global Mirror relationship, a copy of a secondary virtual
disk (VDisk) that is identical to the primary VDisk from the viewpoint of a
host system, even if a power failure occurred while I/O activity was in
progress.
consistent-stopped
In a Global Mirror relationship, the state that occurs when the secondary
virtual disk (VDisk) contains a consistent image, but the image might be
out-of-date with respect to the primary VDisk. This state can happen when
a relationship was in the consistent-synchronized state when an error
occurred that forced a freeze of the consistency group. This state can also
happen when a relationship is created with the create-consistent flag set to
TRUE.
consistent-synchronized
In a Global Mirror relationship, the status condition that occurs when the
primary virtual disk (VDisk) is accessible for read and write I/O
operations. The secondary VDisk is accessible for read-only I/O operations.
See also primary virtual disk and secondary virtual disk.
container
A data storage location; for example, a file, directory, or device.
A software object that holds or organizes other software objects or entities.
copied
In a FlashCopy mapping, a state that indicates that a copy has been started
after the copy relationship was created. The copy process is complete and
the target disk has no further dependence on the source disk.
copying
A status condition that describes the state of a pair of virtual disks
(VDisks) that have a copy relationship. The copy process has been started
but the two virtual disks are not yet synchronized.
Copy Services
The services that enable you to copy virtual disks (VDisks): FlashCopy,
Metro, and Global Mirror.
counterpart SAN
A nonredundant portion of a redundant storage area network (SAN). A
counterpart SAN provides all the connectivity of the redundant SAN but
without the redundancy. Each counterpart SANs provides an alternate path
for each SAN-attached device. See also redundant SAN.
cross-volume consistency
In SAN Volume Controller, a consistency group property that guarantees
consistency between virtual disks when an application issues dependent
write operations that span multiple virtual disks.
D
data migration
The movement of data from one physical location to another without
disrupting I/O operations.
degraded
Pertaining to a valid configuration that has suffered a failure but continues
to be supported and legal. Typically, a repair action can be performed on a
degraded configuration to restore it to a valid configuration.
166 IBM System Storage SAN Volume Controller: Hardware Installation Guide
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