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The MU number indicates that the pair is a Business Copy pair and not a Continuous Access

Synchronous pair. Once the correspondence between the paired logical volumes has been defined

in the HORCM_DEV section of the configuration file, you can use the configuration file to group

the paired volumes into volume groups that can be managed by the host operating system's LVM

(logical volume manager).

The host's LVM allows you to manage the Continuous Access Synchronous/Business Copy volumes

as individual volumes or by volume group. Continuous Access Synchronous/Business Copy

commands can specify individual logical volumes or group names. For LUSE volumes, you must

enter commands for each volume (LDEV) within the expanded LU. If you define volume groups and

you want to issue commands to those volume groups, you must register the volume groups in the

configuration file. For further information about the server LVM, see the user documentation for

your corresponding operating system.

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.

Table 30 (page 156) lists and describes the Continuous Access Synchronous and Business Copy

pair status terms. Table 31 (page 157) 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 32 (page 158) shows the relationship between pair status and Continuous Access

Synchronous/Continuous Access Journal command acceptance.

• Table 33 (page 158) shows the relationship between pair status and Business Copy command

acceptance.

• Table 34 (page 160) shows the relationship between pair status and Snapshot command

acceptance.

For detalis on pair status of Continuous Access Synchronous Z, Business Copy Z, and Continuous

Access Journal Z, see “Pair operations with mainframe volumes” (page 88).

Table 30 Continuous Access Synchronous and Business Copy pair status

SecondaryPrimaryBusiness Copy Pair StatusContinuous Access Synchronous Pair

Status

R/W enabledR/W enabledUnpaired volumeUnpaired volumeSMPL

R enabledR/W enabledPaired volume. Initial copy is complete.

Updates are processed asynchronously.

Paired volume. Initial copy is complete.

Updates are processed synchronously or

asynchronously.

PAIR

R enabledR/W enabledIn 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 enabledR enabledIn 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 enabledIn 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)

156 Data replication operations with RAID Manager

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