Fujitsu Eternus DX100 S3 User Manual page 431

Chapter 4 Copy Function Settings and Display
4.1 Advanced Copy Management
Case.5. 2048MB of memory is assigned to one partition, and 1024MB of memory is assigned to six separate
partitions:
2,048MB
4.1.5.5 Assigning REC Disk Buffers
An REC disk buffer is used with REC buffer for REC Asynchronous Consistency Mode when an REC buffer over-
flow has occurred. An REC disk buffer is made from four disks and is displayed as a RAID group of RAID1+0.
However, it is only used as an REC disk buffer. Up to 4 REC disk buffers can be assigned to one REC buffer.
The following figure shows how the REC disk buffer is used:
REC source storage
■ Summary of REC disk buffer settings through CLI
The steps involved in settings an REC disk buffer using CLI are as follows:
Procedure
1
Create REC disk buffer.
To create an REC disk buffer, choose four disks that do not belong to a RAID group by using the "create
rec-disk-buffer" command.
Then create a volume from this RAID group. This is a RAID group that can be displayed by using the
"show rec-disk-buffer" command.
2
Format REC disk buffer volume.
When an REC disk buffer is created, a volume is also created. This volume must be formatted by using
the "format rec-disk-buffer" command.
1024MB 1024MB
RA
Assign REC buffer for each session.
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ETERNUS CLI User's Guide
Copyright 2014 FUJITSU LIMITED
1024MB 1024MB
Data overflow
is temporarily
cached in the
REC disk buffer.
REC destination storage
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1024MB 1024MB
RA
P2X0-1210-05ENZ0