Fujitsu ETERNUS DX80 S2 Cli User's Manual page 416

Chapter 4 Function/System Settings and Display
4.2 Advanced Copy Management
4.2.5.3 REC Multiplicity
An REC multiplicity value must be set for the REC path between storage systems, and is determined based on
the following two values:
• Effective line speed (as described in the REC path information file)
• Round trip time (as actually measured using a CLI command)
The schematic diagram for determining the REC multiplicity is as follows:
Effective line speed
(In path information file)
4.2.5.4 Assigning REC Buffers
An area that is used to divide REC buffers is called a partition. This area can also be called a group. An REC
buffer must be assigned when the REC Asynchronous Consistency function is used. Up to 8192MB (*1) can be
assigned in the memory space area of REC buffers, and this can be separated into several partitions for each
CM. The maximum number of partitions in the system is 8 (*1). The maximum size of a partition is 2048MB
and the minimum is 128MB. Each partition is handled by specifying its partition number from 0 to 7 (*1).
*1: These are the specification values for the ETERNUS DX440 S2. Values differ among models and types. For details,
refer to the "set rec-buffer" command.
The following example shows how partitions can be assigned for the ETERNUS DX440 S2:
Case.1. No partitions assigned:
Case.2. The maximum size memory is assigned to a single partition:
2,048MB
Case.3. 2048MB of memory is assigned to four separate partitions:
2,048MB
Case.4. 1024MB of memory is assigned to eight separate partitions:
1024MB
Multiplicity
Output
Recommended value
(Calculated from three values)
Automatic calculation by the system
Round trip time
(Measured value)
2,048MB
1024MB 1024MB 1024MB
ETERNUS CLI User's Guide
Copyright 2015 FUJITSU LIMITED
A different multiplicity
may be manually set.
Input (two values)
8,192MB
2,048MB
1024MB 1024MB
416
2,048MB
1024MB 1024MB
P2X0-1030-09ENZ0