Answer: Primary storage is online disk storage used by applications and systems. It is local to applications systems.
2:
What is secondary storage, and where is it located?
A2:
Answer: Secondary storage is used by remote copy systems to hold redundant copies of data. It can be located at the primary site or at remote secondary sites.
3:
What are the three primary objectives of remote copy systems?
A3:
Answer: Provide ready access to data at remote storage sites
Maintain data consistency
Resume normal operations at the primary processing site
4:
How can remote copy slow down application processing?
A4:
Answer: Responses from write commands can be delayed, causing an I/O bottleneck.
5:
What is the latency of signal propagation in a fiber-optic cable?
A5:
Answer: 5 microseconds per kilometer or 8 microseconds per mile
6:
How many signals have to be transmitted for each write operation in remote copy?
A6:
Answer: Four
7:
What is the difference between synchronous and asynchronous mode?
A7:
Answer: Synchronous mode acknowledges each write before forwarding another. Asynchronous mode allows multiple writes to be forwarded without receiving an acknowledgment from the remote site.
8:
True or false: The receiving controller never acts like a SCSI initiator.
A8:
Answer: False. It acts like an initiator when writing to secondary storage.
9:
Name three locations where secondary storage can be found.
A9:
Answer: Local site or campus, bunker site, and remote site
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