(I'm not dismissing other responses, just focusing on the original
question.)
Pawel,
If you have only ICF LPARs contained in the same CECs that run the MVS
images in question, you MUST duplex the structures. Overhead may be a pain
point but it is not a variable in your decision.. Failure to duplex exposes
you to recovery hell if you lose an entire CEC.
Having said that, I cannot recall losing an entire CEC in this millennium.
Still, it's a situation Dr. Murphy would rub his hands and chortle over.
In the case of DB2, he will do his own duplexing because (I believe) the
critical need for duplexing was recognized and addressed by them before
system managed duplexing went GA. The books will tell you which structures
to duplex, which by system and which by 'user', as well as structures like
ISGLOCK (GRS) that do not need duplexing. You should follow the
recommendations religiously.
.
.
JO.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[EMAIL PROTECTED]
Pawel Leszczynski
<pawel.leszczynsk
[EMAIL PROTECTED]>
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12/11/2007 08:20
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<[EMAIL PROTECTED]
.EDU>
Hello everybody,
I've got a question to guys running DB2 in parallel sysplex environment.
Do you duplex DB2 lock structures i.e. _LOCK and _SCA structure?
What is the overhead connected with it?
In our 2-node PS environment we don't have stand-alnone CF, only
internal CF in two different footprints.
We want to avoid situation when damage of one of the boxes
will bring the whole DB2 sharing group down.
Regards,
Pawel Leszczynski
PKO BP SA
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