HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)

secondary data volume status to PSUS, and the primar y storage system detects the pair deletion (if the
path
status is normal) and changes the primary data volume status to PSUS.Whenapairisreleasedfrom
the
primary storage system, the primary storage system changes the status of both data volumes to SM PL.
When a pair
is released from the secondar y storage system, the secondary storage system changes the
secondary data volume status to SMPL, and the primary storage system detects the pair release (if the
path status is normal) and changes the primary data volume status to PSUS.
When a 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 which indicates the reason for suspension.
• Continuous Access Journal Pair Status
The Continuous Access Journal Suspending and Deleting (releasing) transitional states occur
when a request to change the Continuous Access Journal pair status has been accepted, but the
change to the requested status (PSUS, PSUE, or SMPL) is not yet c omplete. 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 D eleting (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.
After a storage system receives a request for splitting or releasing a pair in Flush mode, the status
of the pair will remain 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 ÷100) × 1,024÷V(the unit is seconds)
where:
• C is the total capacity of the master journal volume. The unit is megabytes.
• 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
“Usage Monitor O perations” on page 141).
This Continuous Access Journal pair status describes:
•
Continuous Access Journal split type (PS US) (see “Split Types (PSUS)” on page 35),
•
Continuous Access Journal suspend type (see “Suspend Types”onpage 37),
•
Continuous Access Journal suspend condition (see “Suspension Conditions”onpage38).
Table 4 C ontinuous Access Journal D a ta Volume Pair S tatus
Pair Status Description Primary
Data
Volume
Access
Secondary
Data
Volume
Access
SMPL (simplex)
This volume is not currently assigned to a
Continuous Access Journal data volume pair.
This volume does not belong in the journal
group. When this volume is added to a
Continuous Access Journal data volume pair,
its
status will change to COPY.
Read / W rite Read / Write
COPY
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 PAIR.
Read / W rite Read Only
PAIR
This data volume pair is synchronized.
Updates to the primary data volume are
duplicated on the secondary data volume.
Read / W rite
Read Only
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