ca.portal.admin

Re:Re: IDMS @ TDMF

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.


Regards,
Steve

Steve Terry
BT

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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
up
and running?



David Brenner

IDMS SYSTEM PROGRAMMER

ACS

2828 N. Haskell

Dallas, TX 75204

214-841-6492

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Normal

Normal
Re: IDMS @ TDMF
"Hi again,

I probably should have mentioned in my earlier reply - in cases of broken
chains - there have which been a few times I've been involved in researching
situations similar (I think), to the one you may be facing. In each of
these instances - when the journal was found to contain records from BOTH
database pages involved - IDMS later was found to be ""clean"" and the problem
was associated with various kinds of faulty hardware caching issues.

So, Basically the problems turned out to be - a database page just didn't
get flushed to disk - even though IDMS was ""told"" (by underlying software or
hardware layers) that the page WAS successfully written.

When I say we found - on the journals - records representing ""both database
pages involved"", more specifically I mean we located BOTH Record-A and
Record-B (as I describe them below) :

Record-A whose dbkey shows it is stored on Page-A and whose set dbkey(s)
point to at least one different Record-B - where the pointed-to Record-B has
a dbkey showing it should be on Page-B - (but where the changes to Page-B
are the ones missing from the database).

-Dennis

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