HP XP P9500 Storage - Manual (Page 142)

Continuous Access Synchronous/Business Copy/Continuous Access Journal pair
status
Each Continuous Access Synchronous pair consists of one P-VOL and one S-VOL, and each Business
Copy pair consists of one P-VOL and up to nine S-VOLs when the cascade function is used.
Continuous Access Synchronous and Business Copy pair status (page 142) lists and describes the
Continuous Access Synchronous and Business Copy pair status terms. Continuous Access Journal
pair status (page 143) lists and describes the Continuous Access Journal pair status terms. The P-VOL
controls the pair status for the primary and secondary volumes. The major pair statuses are SMPL,
PAIR, PSUS/PSUE, and COPY/RCPY. Read and write requests from the host are accepted or
rejected depending on the pair status of the volume.
The pair status can change when a RAID Manager command is executed. The validity of the
specified operation is checked according to the status of the volume (primary volume).
•
Table 30 (page 144) shows the relationship between pair status and Continuous Access
Synchronous/Continuous Access Journal command acceptance.
•
Table 31 (page 144) shows the relationship between pair status and Business Copy command
acceptance.
•
Table 32 (page 146) shows the relationship between pair status and Snapshot command
acceptance.
For details on pair status of Continuous Access Synchronous Z, Business Copy Z, and Continuous
Access Journal Z, see
(page 87) .
Table 28 Continuous Access Synchronous and Business Copy pair status
Secondary Primary Business Copy Pair Status Continuous Access Synchronous Pair
Status Status
R/W enabled R/W enabled Unpaired volume Unpaired volume SMPL
R enabled R/W enabled Paired volume. Initial copy is complete.
Updates are processed asynchronously. Paired volume. Initial copy is complete.
Updates are processed synchronously or
asynchronously. PAIR
R enabled R/W enabled In paired state, but initial copy, pairsplit,
or resync operation is not complete. In paired state, but initial copy, pairsplit,
or resync operation is not complete. COPY
Includes COPY(PD), COPY(SP), and
COPY(RS) status. Includes COPY(PD), COPY(SP), and
COPY(RS) status.
R enabled R enabled In paired state, but reverse resync
operation is not complete. Includes
COPY(RS-R) status. Not used for Continuous Access
Synchronous RCPY
R/W enabled
when using R/W enabled In paired state, but updates to the S-VOL
data are suspended due to user-requested In paired state, but updates to the S-VOL
data are suspended due to user-requested PSUS
(split)
write enable
pairsplit option pairsplit. The RAID storage system keeps
track of P-VOL and S-VOL updates while
the pair is split. pairsplit. The RAID storage system keeps
track of P-VOL and S-VOL updates while
the pair is split. SSUS
(split)
R enabled R/W enabled
if no error In paired state, but updates to the S-VOL
volume data are suspended due to an In paired state, but updates to the S-VOL
data are suspended due to an error PSUE
(error)
or PFUS
occurs in the
primary volume error condition. When a PSUE pair is
resynchronized, the RAID storage system condition. (PSUE is PSUS with reason of
internal error. PFUS is PSUS with reason
of sidefile full.)
copies the entire P-VOL to the S-VOL
(same as initial copy).
R enabled R/W enabled
if no error Not used for Business Copy Used for Continuous Access Synchronous
LUSE pairs only. In paired state, but PDUB
occurs in the
primary volume updates to one or more LDEVs within the
LUSE pair are suspended due to error
condition.
142 Data replication operations with RAID Manager