HP B6960-96035 User Manual download pdf (Page 276)

allocation of logical volumes on physical disks, but you can influence it with a choice

of protection characteristics.

RAID

Redundant Array of Inexpensive Disks (RAID) technology is used to control the way

in which the data is distributed across the physical disks within a disk array. Various

levels of RAID are available, providing different levels of data redundancy and data

security, speed and access time. For example, RAID0 provides no duplication of

data, RAID1 provides duplication of all data, RAID5 provides protection of data by

parity.

The snapshot integrations for Data Protector are designed to work with disk arrays

that use the snapshot technology, such as HP StorageWorks Virtual Array and HP

StorageWorks Enterprise Virtual Array.

Snapshot concepts

In a typical basic setup using the snapshot technology, a single disk array might be

connected to separate application and backup systems. The disk array can be used

as a storage device by both the application system and the backup system and logical

volumes can be mounted on either. Using this arrangement, the application system

uses logical volumes within the disk array to store its data during its normal operation.

The logical volumes storing the application system data are for the needs of Data

Protector snapshot integrations also referred to as source volumes. When a snapshot

backup is performed, the application data residing on the source volumes is replicated

and written to other logical volumes of the same disk array, also referred to as target

volumes. This replicated data is also referred to as snapshot data and presents an

almost instantaneous point-in-time copy of a given filesystem or volume. The set of

thus created target volumes is referred to as replica. Once the replica for snapshot

data is created, the primary data can continue being modified without affecting the

backup operation.

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HP B6960-96035 User Manual Page 276