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Suppose I have a Storwize full of SSDs. I have all my data in iASP
because I use PowerHA. I already do flash copies for other reasons such
as Backup and training. However there are a group of folks that do
ad-hoc queries all day from windows servers and they often submit a half
a kabilion of these things all at once. THEN they have the nerve to
complain that they get different totals when they compare. Well querying
the data at different points in the day will do that on live data, DUH!
Flash copy to the rescue I believe. Now they can query last night's
data. Also it nicely boxes them into x CPU and y Memory. And while the
I/O itself is the same physical disks that's not been a problem for
performance.
QUESTION though is what happens to the plan cache for all their queries
when I re-flash the disk. Does it get flushed in a flash? That would
sorta suck.
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