Hp XP P9500 Storage Bedienungsanleitung PDF herunterladen (Seite 28)

Port requirements

Ports set up for Continuous Access Synchronous operations have the following maximum and

minimum requirements:

• One initiator port can be connected to a maximum of 64 RCU target ports.

• One secondary system port can be connected to a maximum of 16 ports on a primary system.

The number of logical paths that can be specified does not depend on the number of ports

configured for Continuous Access Synchronous.

Planning consistency groups

With consistency groups, you perform Continuous Access Synchronous operations on a group of

pairs that are within the same primary and secondary systems. You assign pairs to a consistency

group during the paircreate operation. Consistency groups insure that pairs in the group are kept

in a consistent status. They also allow you to perform an operation on all the pairs at the same

time.

You determine which pairs to include in a consistency group. This should be based on your criteria

for keeping status consistent across a particular group of pairs, and for performing specific

operations at the same time on the pairs.

• For information on creating pairs and assigning them to consistency groups using RAID

Manager, see the HP P9000 RAID Manager User Guide.

• With Remote Web Console, only one consistency group is supported. New pairs are assigned

to consistency group 127 automatically when you turn function switch 30 ON, create the pair

or pairs, then turn function switch 30 OFF.

Consistency group requirements

Consistency groups used with Continuous Access Synchronous pairs have the following requirements:

• A Continuous Access Synchronous pair can be assigned to only one consistency group.

• Use 8,192 pairs or less in one consistency group.

• Between one MCU and one RCU, you can have up to 128 consistency groups.

• Continuous Access Synchronous pairs cannot be in the same consistency group as Continuous

Access Synchronous for z/OS pairs.

Ensuring consistent status for pair suspensions, path failure

This section discusses the following specific conditions and subsequent behavior. This discussion

applies to both Remote Web Console and RAID Manager users.

• When a pair in consistency group 127 suspends for any reason, you can ensure that all

P-VOLs in the group become suspended.

• When the Continuous Access Synchronous data paths between the secondary and primary

system fail, you can insure that all S-VOLs in consistency group 127 are placed in PSUE status.

To cause one or both of these behaviors

1. Turn Function Switch 30 On. Click the System Options tab to locate the Function Switch node

at the bottom of the node tree on the left side of the screen.

• Turn the switch on in the primary and secondary systems to get both behaviors.

• Turn the switch on only in the system where you want the related behavior (primary for

consistent P-VOL suspensions, secondary for consistent S-VOL PSUE status).

28 Planning for Continuous Access Synchronous

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Hp XP P9500 Storage Bedienungsanleitung Seite 28