The customer has two HP 3PAR StoreServ 7000 Storage systems split between two data centers.
Used capacity of each storage system is 10 TB of data. The replication between data centers is
performed via Ethernet/IP, and the replication technology used will be asynchronous. The
maximum RPO is 30 minutes, and the daily change rate of the customer data is a maximum of
0.5%, which is created evenly throughout the day.
What is the required minimum bandwidth between the data centers for replication?
A.
40 Mb half-duplex
B.
20 Mb full-duplex
C.
5 Mb half-duplex
D.
10 Mb full-duplex
Explanation:
10TB * 0.5% / (3600 * 24 / 0.5) = 0.303 MB/s = 3 Mbps per datacenter (full duplex!!!).
D – 0,5% of 10TB is 50GB. To transfer 50GB in 30 minutes to other site a minimum of 10Mb/s bandwidth is required:
10Mb * 60 sec = 600Mb/min
600Mb * 30min = 1800B > 50GB
Since a bandwidth of 5MB/s is half duplex, the minimum transfer guaranteed is 45Gb, that is not enough.
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