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Supported XRC functions in XRC2 and XRC3

The following table lists the supported Compatible XRC features in IBM XRC functions (XRC2 and

XRC3).

XRC3XRC2DescriptionFeature

SupportedSupportedSidefile threshold tuning feature for each volume.DEV blocking

SupportedNot supportedDifferential copy feature for unplanned outage achieved

by the differential bit management in the storage system.

Unplanned outage

SupportedNot supportedAlternate path retry feature for CNT USD

connections.CNT MULTI path

Supported

Not supportedFix or Float of Utility DEV setting feature.Fix utility

Supported

Not supportedSuspend setting feature which does not report SCP from

SDM.

Suspend on Long

Busy

Supported

Not supportedFeature to set arbitrary Sleep Time from SDM when the

amount of write data is controlled.

Write Pacing

Supported

Not supportedThis function enables SDM to read the sidefile parallel

using the primary session and its auxiliary sessions in the

Multiple Reader

primary storage control session. It reduces data stagnation

of the sidefile compared with ordinary Single Reader.

SupportedNot supportedThis function is used to reduce the handshake time to

connect the channel and control unit, and then uses the

Extended Distance

FICON

extended IU Pacing protocol to maintain the long distance

communication status.

Notes:

1. CNT extender (Ultranet Storage Director).

2. Only Fix of Utility DEV is supported (Float is not supported).

3. Operates when Level 2 Suspend is set to Disabled in the option of Compatible XRC. Level 2 Suspend operation

will be processed preferentially, when Level 2 Suspend is set to Enable.

4. Operates when Block Option is set to Volume Level in the option of Compatible XRC. Write Pacing will not operate

when Block Option is set to Cache Level.

5. Functioning on DKC emulation type I-2107 and later.

6. Install Parallel Access Volumes or Hyper Parallel Access Volumes, if you use this function. See (page 17), when you

use Hyper Parallel Access Volumes.

When the controller emulation type is I-2107, both XRC2 and XRC3 are supported.

Number of sessions for Compatible XRC and CC

The following table shows the number of supported sessions in Compatible XRC.

Number of SessionsUnit

Number of CUs x 64Per storage system

64*Per CU

1Per volume

*Primary and auxiliary sessions are assigned when Multiple Reader function is used. The number of auxiliary sessions

is a parameter of NumberReaderTasks which is defined in a XRC PARMLIB data set. This parameter defines multiplicity

of auxiliary sessions on a primary session. For example, the following example shows that the three auxiliary sessions

are enabled and multiply on a primary session.

NumberReaderTasks *,4

Set up and requirements 9

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 36 37

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