Chapter 7 Advanced Copy Management
7.8 REC Management
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
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6 Click the [Done] button to return to the [Copy Path] screen.
7.8.6 Modify REC Buffer
This function sets parameters of the REC Buffer for copying data via the REC in Consistency mode.
The "Consistency mode" secures the order of data transfer to the remote device for all of the specified REC
sessions. This mode requires constant securement of the dedicated REC Buffer in the cache memory. Copying
via REC Buffer stores multiple REC session I/Os in the REC Buffer for a certain period of time, and copies in
blocks.
REC Buffer specifications for each model
Model Total size of all of the REC
Buffers (per CM)
The maximum number of
REC Buffers
The maximum size of a
single REC Buffer
ETERNUS DX100 S3 128 MB 1 128 MB
ETERNUS DX200 S3 512 MB 4 512 MB
ETERNUS DX500 S3
8192 MB 8 2048 MB
ETERNUS DX600 S3
ETERNUS DX8700 S3
ETERNUS DX8900 S3
ETERNUS DX200F 512 MB 4 512 MB
• Registering the license for the Advanced Copy function is required to set the REC Buffer.
• This function can only be used when the local storage system (the storage system that creates REC
Buffers) supports REC.
• Perform REC Buffer settings in both the REC copy source and destination storage systems.
• When changing REC Buffers, suspend the sessions using the target REC Buffers.
• When deleting REC Buffers, stop the sessions using the target REC Buffers.
• This function cannot be used when the remote device and/or copy path have not been configured.
• Cache memory is not only used for REC Buffers, but also used for the copy table. Note that the REC Buffer
with the maximum size for each model cannot be created depending on the memory capacity in the
ETERNUS DX and the copy table size.
• Because REC Buffers are duplicated between the CMs, the actual memory capacity is twice as large as the
selected REC Buffer capacity.
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