Discussion created by ca.portal.admin on Jul 20, 2006
Hi Dave,
We make extensive use of TDMF and have not had any problems with it.
We are just coming to the end of a data centre consolidation project
where we have moved well over 50 CV's from one data centre to another
using TDMF. The CV's, which are very busy, were up and running during
the transfers and we have not had any problems.

The only time I have seen a problem was when we used it on a failing
box, moving the volumes off to a good box without having to take the
service down. The disk performance, which was very poor anyway, took a
further hit which caused IDMS problems - but I have never seen a problem
when using it against a good device.

I also used LDMF for the first time a few weeks ago. This lets you move
individual files whilst IDMS is still accessing them. Again no problems.


Steve Terry

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We are using TDMF to copy our system from one set of dasd to another
set of
dasd. Has anyone out in IDMS land had any positive, negative or neural
experiences with using TDMF to move idms database while the database is
and running?

David Brenner



2828 N. Haskell

Dallas, TX 75204

214-841-6492 <>
IDMS Public Discussion Forum


Re: Maximum Page Size for IDMS Database Files
"Reason, if you look at a BDAM DCB, filesize is a half word, ""7FFF""
(positive) or 32767 max.

Edward A. Timm
Sallie Mae, Senior Database Analyst
(317) 596-1182
Fax (317) 595-1494 07/20/2006 01:35:30 PM >>>
I am late to this party, so I apologize. But I find no references in
IBM literature for support for BLKSIZEs above 32k for CKD devices; the
maximum specified in all references is 32760. I think it may be
possible for FBA type devices, but not CKD. I did find references for
BLKSIZES up to 2g, but that was for tape devices ONLY.

Dan Miley
Lockheed Martin