reorg HUGE file

I've got a file with 40 million records, 10 million of which are deleted.  The
file is over 14 GB.  There are 8 access paths built on this file.  We would
like to attempt a reorg of this file, but are concerned about the downtime
we'll experience as this file is used throughout our operations.  Is there any
reliable way to estimate the time required to reorg?

FWIW, this is a model 510 running V3R7 and it has 94 GB of DASD, of which 76%
is currently being used, and 392 MB of memory.

If I did a RGZPFM, I'd remove the members from the file's logicals before the
reorg, and then add them back after.  I think I've heard it would be more
efficient to do so.

Should I also consider duplicating the physical file in a separate library and
using CPYF to copy the 30 million records into it, then duplicate the logicals
over, then delete the original library's files, then move the newly copied
data over?

Your "been there, done thats" would be greatly appreciated.

Dan Bale
IT - AS/400
Handleman Company
248-362-4400  Ext. 4952
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