May 2011
Intermediate to advanced
626 pages
15h 3m
English
book
Implementing the IBM Storwize V7000
by Brian Cartwright, Ronda Hruby, Daniel Koeck, Xin Liu, Massimo Rosati, Thomas Vogel, Bill Wiegand, Jon Tate
Content preview from Implementing the IBM Storwize V7000
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350 Implementing the IBM Storwize V7000 V6.3
Also, Easy Tiering is based on an algorithm with a threshold to evaluate if an extent is cold or
hot. If an extent activity is below this threshold, it is not considered by the algorithm to be
moved to the SSD tier. So you can expect to have used extents and free extents in both tiers
without having all the SSD tier extents that are allocated.
The four main processes and the flow between them are described in the following sections.
10.3.1 I/O Monitoring
The I/O Monitoring (IOM) process operates continuously and monitors volumes for host I/O
activity. It collects performance statistics for each extent and derives averages for a rolling
24-hour period of I/O activity.
Easy Tier makes allowances for large ...
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