Initial And Update Copy Operations; Initial Copy; Update Copy - HP StorageWorks P9000 User Manual

Business copy for mainframe systems user guide

Show thumbs Also See for StorageWorks P9000:

Table of Contents

Initial and update copy operations

When you create a pair, the system executes an initial copy. When the pair is created, the storage

system asynchronously copies updates received by the S-VOL to the T-VOL.

When you create a pair, the initial copy is started by the system, and all the data in the S-VOL is

copied to the T-VOL.

Before the pair creation the pair's status is Simplex.

While the initial copy is in progress, the status is Pending.

The status changes to Duplex when the initial copy is complete.

Figure 2 Initial copy operation

An S-VOL continues receiving updates from the host during the initial copy. When the initial copy

is completed, update copy operations start.

I/O sent to the S-VOL in Duplex status is marked as differential data and stored in bitmaps for

transfer to the T-VOL. Update copy operations are performed periodically by the system. The timing

of the update copy operation is based on the amount of differential data that accumulates and the

elapsed time since the previous update.

Business Copy Z overview