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Chapter 2 About Universal Replicator Operations 2-37
Hitachi Universal Replicator for IBM /OS User’s Guide
Table 2-5 Suspend Types
Suspend Type Applies to Description
Secondary
data volume
by operator
Primary data
volume, secondary
data volume
The user suspended the pair from the primary storage system or
secondary storage system using the secondary data volume option.
By MCU Secondary data
volume
The secondary storage system received a request from the primary storage
system to suspend the volume pair. The primary data volume suspend
type is Primary data volume by Operator or Secondary data volume by
Operator.
By RCU Primary data
volume
The primary storage system detected an error condition at the secondary
storage system which caused the primary storage system to suspend the
URz volume pair. The secondary data volume suspend type is By MCU.
Delete Pair to
RCU
Primary data
volume
The primary storage system detected that the secondary data volume
status changed to simplex because the user released the pair from the
secondary storage system. The pair cannot be resumed because the
secondary data volume does not have the suspended status.
Secondary
Data Volume
Failure
Primary data
volume
The primary storage system detected an error during communication with
the secondary storage system or an I/O error during update copy. In this
case, the secondary data volume suspend type is usually By MCU.
MCU IMPL Primary data
volume, secondary
data volume
The primary storage system could not find valid control information in its
nonvolatile memory during the IMPL procedure. This condition occurs only
if the primary storage system is completely without power for more than
48 hours (e.g., power failure and fully discharged backup batteries).
Initial Copy
failed
Primary data
volume, secondary
data volume
The volume pair was suspended before the initial copy operation was
complete. The data on the secondary data volume is not identical to the
data on the primary data volume.
JNL Cache
Overflow
Primary data
volume, secondary
data volume
The data volume pair was suspended because it was highly likely that
journal data will overflow.
MCU P/S OFF Secondary data
volume
The primary storage system is powered off.
Table 2-6 Consistency Status for Suspended URz Secondary Data
Volumes
Consistency Status Description
Volume This URz volume pair was suspended alone. Update sequence consistency between this
secondary data volume and other secondary data volumes in this journal group is not
ensured. This secondary data volume cannot be used for disaster recovery at the secondary
system. This status is indicated when:
– This volume pair was suspended by a user-initiated suspend pair operation with the
URz Suspend option set to Volume.
– This volume pair was suspended due to a failure that did not affect the entire
consistency group, and the Error Level pair option for this pair is set to Volume.