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Using the IBM System Storage N Series with Databases
book

Using the IBM System Storage N Series with Databases

by Alex Osuna, Arthur Li, Sanjay Adhikary, Roger E. Sanders, Mika Nikolopoulou
August 2007
Intermediate to advanced content levelIntermediate to advanced
374 pages
10h 53m
English
IBM Redbooks
Content preview from Using the IBM System Storage N Series with Databases
50 Using the IBM System Storage N Series with Databases
That means that after a Snapshot is taken, each update operation performed generates three
I/O requests (1 read - old data, 1 write - old data, and 1 write - new data). However, the mount
of I/O required, along with the amount of additional storage space needed is magnified each
time a new Snapshot is taken. When multiple Snapshots exist and the block a Snapshot
refers to is changed, the storage system must read the contents of the original block in the
active file system, create a new block in each copy out region that exists, write the original
block’s contents to every new block created, ...
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