which solution would you recommend?

ABC.com has a DMX 1000 at its production site. ABC.comis planning to purchase another DMX
1000 for its Disaster Recovery (DR) site 20 miles from the production site. While information
gathering, you conclude that its RPO is 30 minutes. ABC.com has a total of 30 LUNs that will need
to be replicated to the remote site via a T3 link. ABC.com’s application is sensitive to response
times. After using Performance Analyzer to collect data for a normal working day, you note the
following Analyzer values:
Write response time: 5msRead response time: 14msAverage I/O size: 4KBWrite/s: 400Reads/s:
700
Of the following, which solution would you recommend?

A.
SRDF/S

B.
SRDF/AR

C.
SRDF/A

D.
Open Replicator

Explanation:
By having the target just a few seconds behind the source, performance of source applications
can be significantly improved over SRDF/S.
The “application is sensitive to response times” – which means that SRDF/S might not be the best

solution. If we use the rule of thumb that every 125 circuit miles adds a millisecond of latency each
way, the replication will add 1 ms each way – which could cause the write response to go up to
7ms.
With the RPO of 30 minutes, however, the delay with SRDF/AR is unacceptable. Ask what is the
availability of data / what is the maximum possible data loss with this solution?
– Days / hours (SRDF/AR)
– Seconds / Minutes (SRDF/A)
– None (SRDF/S or Multi-hop SRDF/AR)
– Are the Recovery Time Objective ( RTO ) / Recovery Point Objective (RPO) goals being met