Hp MSA 2040 SAN Storage Manuel d'utilisateur télécharger pdf (Page 31)

Glossary 31

secondary volume The volume that is the destination for data in a replication set and that is not accessible to

hosts. For disaster recovery purposes, if the primary volume goes offline, a secondary

volume can be designated as the primary volume. The secondary volume exists in a

secondary vdisk in a secondary (or remote) storage system.

The contents of a secondary volume are in a constant state of flux and are not in a

consistent state while a replication is in process. Only snapshots that are associated with a

secondary volume are data consistent.

SES SCSI Enclosure Services.

single-port disk A disk that is connected to both controllers so its data path is not fault-tolerant. A single-port

disk’s type is shown as SAS-S or SATA-S.

snap pool A volume that stores data that is specific to snapshots of an associated master volume,

including copy-on-write data and data written explicitly to the snapshots. A snap pool

cannot be mapped.

snapshot A “virtual” volume that preserves the state of a master volume’s data as it existed when the

snapshot was created. Data associated with a snapshot is recorded in both the master

volume and in its associated snap pool. A snapshot can be mapped and written to. The

capability to create snapshots is a licensed feature. Snapshots that can be mapped to hosts

are counted against the snapshot-license limit, whereas transient and unmappable

snapshots are not.

SRA The HP MSA Storage Replication Adapter.

SRM VMware vCenter Site Recovery Manager.

ULP Unified LUN Presentation. A RAID controller feature that enables a host to access mapped

volumes through any controller host port. ULP incorporates Asymmetric Logical Unit Access

(ALUA) extensions.

unwritable cache data Cache data that has not been written to disk and is associated with a volume that no longer

exists or whose disks are not online. If the data is needed, the volume’s disks must be

brought online. If the data is not needed it can be cleared, in which case it will be lost and

data will differ between the host and disk. Unwritable cache is also called orphan data.

vdisk A “virtual” disk comprising the capacity of one or more disks. The number of disks that a

vdisk can contain is determined by its RAID level.

volume A portion of the capacity of a vdisk that can be presented as a storage device to a host.

volume copy An independent copy (clone) of the data in a volume. The capability to create volume

copies makes use of snapshot functionality.

WWN World Wide Name. A globally unique 64-bit number that identifies a node process or

node port.

WWNN World Wide Node Name. A globally unique 64-bit number that identifies a node process.

WWPN World Wide Port Name. A globally unique 64-bit number that identifies a node port.

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Hp MSA 2040 SAN Storage Manuel d'utilisateur Page 31