On Dec 24, 2009, at 3:15 AM, Colin Raven wrote:
Does anyone know if a zfs "pool configuration calculator" (for want
of a better term) exists?
I wrote a tool which does this for homogenous disks. An example of
the output is at:
http://blogs.sun.com/relling/entry/sample_raidoptimizer_output
The OpenStorage appliances offer a (significantly) reduced set of
options.
So the calculators used there are somewhat simplified. But you can
easily
put together a spreadsheet and use the algorithms for MTTDL and the
simple random read performance model to make decisions. See my blog
posts in and around:
http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance
The heterogenous disk analysis can be much more complicated, and is
left as an exercise for the reader.
-- richard
Reason for the question:
We're looking at building a configuration which has some hard limits
(case size for one). It's a collaborative project, and not everyone
resides in the same place (or timezone even), so we would like to
"build" various disk configurations for folks to look at, and hammer
out arguments for/against.
Not everyone knows how to calculate the net space available by
stuffing config-a or config-b in the box, so if a tool exists to
help us visualize this, that would be invaluable (to put it mildly).
I saw Adam's approach here: http://blogs.sun.com/ahl/entry/sun_storage_7410_space_calculator
but, as he says;
Remember that you need a Sun Storage 7000 appliance (even a virtual
one) to execute the capacity calculation
Oops, I wish we had such a creature ("one day" I tell myself!) :)
As always, my thanks in anticipation of any suggestions, pointers
and the like.
Warm regards to all,
-Colin
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