Silicon Graphics InfiniteStorage 4000 Series, Настройка и обслуживание

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46 Volumes
NOTE
You can create a thin volume only from a disk pool, not from a volume group.
Disk pools and thin volumes are available only on the E2600 controller and the E5400
controller.

Access volume
– A factory-configured volume in a storage area network (SAN)
environment that is used for communication between the storage management
software and the storage array controller. The access volume uses a logical unit
number (LUN) address and consumes 20 MB of storage space. The 20 MB of
access volume storage space is not available for data storage.
NOTE
Use the access volume only for in-band-managed storage arrays.

Snapshot (Legacy) volume
– A logical point-in-time image of another volume.
A snapshot (legacy) volume is the logical equivalent of a complete physical copy;
however, it is not an actual, physical copy. Instead, the firmware tracks only the
data blocks that are overwritten and copies those blocks to a snapshot (legacy)
repository volume.

Snapshot (Legacy) repository volume
– A special volume in the storage array
that is created as a resource for a snapshot (legacy) volume. A snapshot (legacy)
repository volume contains snapshot (legacy) data and copy-on-write data for a
particular snapshot (legacy) volume.

Base volume
– A standard volume from which you create a snapshot (legacy)
volume. The term “base volume” is used only to show the relationship between a
standard volume from which you are taking the point-in-time image and a
snapshot (legacy) volume.

Primary volume
– A standard volume in a Synchronous Mirroring relationship.
The primary volume accepts host data transfers and stores application data.
When you first create the mirror relationship, data from the primary volume is
copied in its entirety to the associated secondary volume.

Secondary volume
– A standard volume in a Synchronous Mirroring
relationship that maintains a mirror (or copy) of the data from its associated
primary volume. The secondary volume remains unavailable to host applications
while mirroring is underway. In the event of a disaster or a catastrophic failure of
the primary site, a system administrator can promote the secondary volume to a
primary role.

Mirror repository volume
– A special volume in a Synchronous Mirroring
configuration that is created as a resource for each controller in both the local
storage array and the remote storage array. The controller stores mirroring
information on this volume, including information about remote writes that are
not yet complete. A controller can use this information to recover from controller
resets and accidental power shutdown of the storage arrays.