November 2006
Intermediate to advanced
584 pages
14h
English
book
SAN Multiprotocol Routing: An Introduction and Implementation
by Jon Tate, Steve Fodor, Jure Arzensek
Content preview from SAN Multiprotocol Routing: An Introduction and Implementation
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Chapter 15. IBM TotalStorage m-type family best practices 427
A good start is to assume that 20% of the total amount of data changes during
the day. Your application’s specific tools or operating system utilities can help you
estimate this quantity.
For example, assume that we have 8 TB of data, with 20% changed over a
24-hour period. That is an average 69 GB change in one hour (20% from
8 TB = 1639; 1639 / 24 = 68.3 GB per hour). We can calculate it with a
conservative two to one (2:1) compression ratio, which is near 35 GB per hour
(68.3 / 2 = 34.15).
Let us calculate the required throughput in MBps. Because 35 GB equals
35840 MB, 35 GB per hour translates into 35840 MB per hour, and this is equal
to 9.96 MBps. Therefore, the throughput ...
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