Xp continuous access journal data volume pair – HP XP Continuous Access Software User Manual
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When an XP Continuous Access Journal data volume pair is split or suspended, the primary storage
system generates a service information message (SIM) to notify the host(s). If SNMP is installed
and operational for the storage system, this SIM results in an SNMP trap that indicates the reason
for suspension.
•
XP Continuous Access Journal Pair Status
The XP Continuous Access Journal Suspending and Deleting (releasing) transitional states occur
when a request to change the XP Continuous Access Journal pair status has been accepted,
but the change to the requested status (PSUS, PSUE, or SMPL) is not yet complete. These states
are not reported to the host.
•
In the case of Suspending, both the user and the primary storage system can request the status
change.
•
In the case of Deleting (releasing), only the user can request the status change.
If the user requested the status change, the final status is reported at the end of the transition.
If an error caused the status to change to PSUE, the suspended status is reported at the
beginning of the transition.
Status During Flush Mode
After a storage system receives a request for splitting or releasing a pair in Flush mode, the status
of the pair remains Suspending or Deleting until the journal in the master journal group is restored
to the restore journal group and the pair is completely split or released. To calculate the time during
which the pair remains Suspending or Deleting, use the following equation:
C × (u ч 100) Ч 1,024 ч V (the unit is seconds)
where:
•
C is the total capacity of the master journal volume. The unit is gigabytes.
•
u is the usage rate of data in the master journal volume. The unit is percent.
•
V is the data transfer speed between the primary and the secondary storage system. The unit
is MB/s (megabytes per second).
To find the usage rate of a journal volume, use the monitoring feature (see
).
XP Continuous Access Journal Data Volume Pair Status Types
This XP Continuous Access Journal pair status describes:
•
XP Continuous Access Journal split type (PSUS) (see
“Split Types (PSUS)” (page 38)
•
XP Continuous Access Journal suspend type (see
•
XP Continuous Access Journal suspend condition (see
“Suspension Conditions” (page 41)
)
Table 5 XP Continuous Access Journal Data Volume Pair Status
Secondary Data
Volume Access
Primary Data
Volume Access
Description
Pair Status
Read / Write
Read / Write
This volume is not currently assigned to an XP
Continuous Access Journal data volume pair.
SMPL (simplex)
This volume does not belong in the journal
group. When this volume is added to an XP
Continuous Access Journal data volume pair,
its status changes to COPY.
Read Only
Read / Write
*3
The initial copy operation for this pair is in
progress. This data volume pair is not yet
COPY
synchronized. When the initial copy is
complete, the status changes to PAIR.
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About XP Continuous Access Journal Operations