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Chapter 2 About Universal Replicator Operations 2-39
Hitachi Universal Replicator for IBM /OS User’s Guide
After marking these primary data volume tracks as modified, the primary
storage system discards these journal data. This ensures that journal data
lost during transmission to the secondary storage system are identified and
marked.
• The journal data that reached the secondary storage system but have not
yet been settled.
After marking these secondary data volume tracks as modified, the
secondary storage system discards these journal data.
• The primary data volume records updated by host-requested write I/Os
after the pair was suspended.
When a suspended URz pair is resumed (resynchronized), the contents of the
secondary storage system’s cylinder/track bitmap are sent to the primary
storage system and merged into the primary storage system’s bitmap. The
primary storage system then performs the resync operation according to the
merged bitmap. This ensures that all the tracks including the discarded journal
data are resynchronized at this time.
Business Continuity Manager Support
The USP V storage systems on which URz is installed support the Business
Continuity Manager commands. If the host system console issues the Business
Continuity Manager commands to the USP V storage system, the URz pair
operations can be performed. The Business Continuity Manager commands
allow you to add pairs, suspend pairs, resume pairs, release pairs, monitor the
pair status, add DKC, and delete DKC.
Table 2-8 and Table 2-9 explain the
USP V system adapter ID(SAID) values. For further information and
instructions on Business Continuity Manager, please refer to the Business
Continuity Manager User's Guide.