Hp XP P9500 Storage Bedienungsanleitung PDF herunterladen (Seite 8)

Figure 1 Business Copy configuration for Open and Mainframe

Volume pairs (primary volumes and secondary volumes)

A pair consists of the primary and secondary data volume and the volume. Each primary volume

(primary volume) can be paired with up to three secondary volumes (secondary volumes). Thus,

you can create three pairs using one primary volume.

During most operations, the primary volume remains available to the host for I/O operations.

When the primary volume is updated, the new data, called differential data, is copied to the

secondary volume regularly. Because secondary volumes are updated asynchronously, the primary

and secondary volumes may not be identical. secondary volumes become available for host access

only after the pair has been split or deleted.

Cascaded pairs

Each Business Copy S-VOL can be further paired with a second level S-VOL. A first level (L1) S-VOL

may be paired with two second level (L2) S-VOLs. Thus, up to nine S-VOLs can be available for

one P-VOL.

L2 pairs are referred to as “cascaded pairs”.

8 Business Copy overview

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Hp XP P9500 Storage Bedienungsanleitung Seite 8