Fujitsu ETERNUS DX100 S4 Design Manual page 93

2. Basic Functions
Backup (Advanced Copy)
When an REC is performed over a WAN, a bandwidth that supports the amount of updates
•
from the server 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 devi-
ces).
• When an REC is performed over a WAN, the round-trip time for data transmissions must be
100ms or less. A setup in which the round-trip time is 10ms or less is recommended for the syn-
chronous 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 ses-
sion is suspended. 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.
•
• The following models support REC Disk Buffers.
- ETERNUS DX100 S4/DX200 S4
ETERNUS DX500 S4/DX600 S4
-
ETERNUS DX8900 S4
-
- ETERNUS DX100 S3/DX200 S3
- ETERNUS DX500 S3/DX600 S3
- ETERNUS DX8100 S3/DX8700 S3/DX8900 S3
ETERNUS AF250 S2/AF650 S2
-
ETERNUS AF250/AF650
-
- ETERNUS DX200F
- ETERNUS DX90 S2
ETERNUS DX400/DX400 S2 series
-
ETERNUS DX8000/DX8000 S2 series
-
To use REC Disk Buffers, the controller firmware version of the ETERNUS DX must be
•
V10L60-6000 or later, or V10L61-6000 or later.
When the ETERNUS DX90, the ETERNUS DX400 series, or the ETERNUS DX8000 series is used
•
as the copy destination, REC cannot be performed between encrypted volumes and unencryp-
ted volumes.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
93
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