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What would prevent this from happening in the future?

A customer has an ERP system protected by SRDF/A and experienced a loss of link for 6 hours due to a network issue. When the network issue was fixed the links came back up and SRDF was resumed.
Prior to SRDF/A resuming cycle switching, there was a disaster at the source site, rendering the R1 array unusable. The ERP system was not startable at the DR site and the customer had to restore from tape.
What would prevent this from happening in the future?

Which replication solution would you suggest?

Your Company has been using a CLARiiON CX4 array for several months in their Windows environment and has asked you to help them design a data replication solution to their offsite facility approximately 250 km away. Their current network infrastructure can only provide them the equivalent of a T1 connection to
the second facility, and they are asking for an RPO of no more than 20 minutes. They need to replicate roughly 1.75 TB of data with a change rate of less than 10%. The solution must scale easily and quickly to accommodate anticipated future growth, but provide them the lowest possible entry point to meet the current requirements.
Which replication solution would you suggest?