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Chapter 2 About Universal Replicator Operations 2-35
Hitachi Universal Replicator for IBM /OS User’s Guide
Table 2-4 URz Data Volume Pair Status
Pair Status Description
Simplex
This volume is not currently assigned to a URz data volume pair. This volume
does not belong in the journal group. When this volume is added to a URz data
volume pair, its status will change to pending duplex.
Pending Duplex
The initial copy operation for this pair is in progress. This data volume pair is not
yet synchronized. When the initial copy is complete, the status changes to
duplex.
Duplex
This data volume pair is synchronized. Updates to the primary data volume are
duplicated on the secondary data volume.
Suspended
(see
Table 2-5 for
suspend types)
This data volume pair is not synchronized.
– When the primary storage system detects a URz suspension condition (see
section
Suspension Condition), the primary storage system changes the primary
data volume status and secondary data volume status (if possible) to
suspended.
– When the secondary storage system detects a URz suspension condition (see
section
Suspension Condition), the secondary storage system changes the
secondary data volume status to suspended.
– When you suspend a pair from the primary storage system, the primary storage
system changes the status of the primary data volume and secondary data
volume (if possible) to suspended. When you suspend a pair from the
secondary storage system, the secondary storage system changes the status of
the secondary data volume to suspended.
– When the primary storage system detects that the pair was suspended or
released from the secondary storage system, the primary storage system
changes the status of the primary data volume to suspended.
Suspending
This pair is not synchronized. This pair is in transition from duplex or pending
duplex to suspended. When the suspension is requested (by user, primary
storage system, or secondary storage system), the status of all affected pairs
changes to suspending. When the suspension is complete, the status changes to
suspended.
Deleting
(releasing)
This pair is not synchronized. This pair is in transition from duplex, pending
duplex, or suspended to simplex. When the delete pair operation is requested
(by user), the status of all affected pairs changes to deleting (releasing). When
the delete pair operation is complete, the status changes to simplex.
SEQCHK
The secondary storage system encountered a non-time-stamped journal data
for a URz pair using the System timer type option. This status can be displayed
at the primary storage system and secondary storage system, but the primary
storage system may not have the most current information. Always use the pair
status information displayed at the secondary storage system for disaster
recovery.
Hold
The pair is prepared for delta resync operation. When the status of primary data
volume is Hold, the write data for the TCz Synchronous R-VOL is stored in the
master journal volume.
Only the delta resync operation, releasing operation, or changing pair option
operation are allowed on the pairs in Hold status.
Hlde
An error occurred on the pair in Hold status. When the status of primary data
volume is Hlde, the write data for the TCz Synchronous S-VOL will not be stored
in the master journal volume.
Only recovering pair status to standby (Hold) operation, releasing operation, or
changing pair option operation are allowed on the pairs in Hlde status.