Data is being replicated from site A to site B using disk buffering to create extended distance consistent point in time copies every hour. In the event of a site failure at A, what is the maximum amount of data that will be missing at site B?
A.
2 hours
B.
3 hours
C.
4 hours
D.
1 hour
Why it is not 1 hour?
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In disk-buffered remote replication, the RPO at the remote site is in the
order of hours. For example, a local replica of the source device is created at
10:00 a.m., and this data transmits to the remote replica, which takes 1 hour
to complete. Changes made to the source device after 10:00 a.m. are tracked.
Another local replica of the source device is created at 11:00 a.m. by applying
track changes between the source and local replica (10:00 a.m. copy). During
the next cycle of transmission (11:00 a.m. data), the source data has moved to
12:00 p.m. The local replica in the remote array has the 10:00 a.m. data until
the 11:00 a.m. data is successfully transmitted to the remote replica. If there
is a failure at the source site prior to the completion of transmission, then the
worst-case RPO at the remote site would be 2 hours because the remote site has
10:00 a.m. data.
Chapter 12 n Remote Replication
Section III n Backup, Archive, and Replication
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