Fujitsu ETERNUS AF250 Design Manual page 92

1. Function
Backup (Advanced Copy)
When an REC is performed over a WAN, a bandwidth that supports the amount of updates from the server
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must be secured. Regardless of the amount of updates from the server, a bandwidth of at least 50Mbit/s is
required for the Synchronous mode and a bandwidth of at least 2Mbit/s for the Consistency mode (when
data is not being compressed by network devices).
When an REC is performed over a WAN, the round-trip time for data transmissions must be 100ms or less. A
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setup in which the round-trip time is 10ms or less is recommended for the synchronous transmission mode
because the effect upon the I/O response is significant.
For REC, the data in the copy destination cannot be referenced or updated until the copy session is suspen-
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ded. If the monitoring software (ServerView Agents) performs I/O access to the data in the copy destination,
an I/O access error message is output to the server log message and other destinations. To prevent error
messages from being output, consider using other monitoring methods.
When a firmware update is performed, copy sessions must be suspended.
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The following models support REC Disk Buffers.
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ETERNUS DX100 S4/DX200 S4
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ETERNUS DX500 S4/DX600 S4
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- ETERNUS DX8900 S4
ETERNUS DX100 S3/DX200 S3
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ETERNUS DX500 S3/DX600 S3
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ETERNUS DX8100 S3/DX8700 S3/DX8900 S3
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ETERNUS AF250 S2/AF650 S2
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ETERNUS AF250/AF650
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ETERNUS DX200F
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ETERNUS DX90 S2
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ETERNUS DX400/DX400 S2 series
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- ETERNUS DX8000/DX8000 S2 series
To use REC Disk Buffers, the controller firmware version of the ETERNUS AF must be V10L60-6000 or later.
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When the ETERNUS DX90, the ETERNUS DX400 series, or the ETERNUS DX8000 series is used as the copy
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destination, REC cannot be performed between encrypted volumes and unencrypted volumes.
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
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P3AG-1822-09ENZ0