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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
Chapter 2. Introduction to Data ONTAP 43
Figure 2-12 WAFL data placement
2.1.4 File system consistency and Non-Volatile RAM
In most storage systems, RAID management and file services can put a heavy strain on write
performance. RAID uses a time-consuming read-modify-write sequence to maintain parity,
while file services tries to ensure that data is safely stored before replying to network
requests. WAFL reduces the impact of RAID management by writing to disk locations that
minimize RAID's write performance penalty.
Non-volatile RAM or NVRAM is special memory that is equipped with battery-backup that
allows it to store data for days, even when ...
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Publisher Resources

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