For those of us that cannot remember what DASD models hold how much
data, there is a nifty free DASD calculator available here:
www.centralcoastsoftware.com

It's handy to have around when sizing disk space requirements.

Have a good weekend, too.

Richard Troth wrote:
I was tempted to reply with Dave Boyes' answer.   :-)

The major factor w/r/t wasted space on 3390 geometry is the block size,
for which 4K is most efficient and also what Linux and CMS default to.  So
don't worry so much what model to use  (in terms of space).  But bandwidth
.. ahh,  now there is something to consider.

YOU MAY want to do some I/O load balancing,  where smaller devices as
presented by the storage system will be of help.  But this gets really
complicated because you also need to pay attention to the I/O channels.
(That is,  if you have 15 mod 3s on one path -vs- five mod 9s,  is there
really a difference?)

-- R;



--
DJ
V/Soft

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