There are three phases of a SAVLIB command:

1.   Allocation of the objects
2.   The save itself
3.   Deallocation of the objects

When you do multiple libraries in one SAVLIB command, they overlap, making
the tape spin constantly.  Small objects (like source members) which do not
consult a lot of tape can cause the tape to stall.

Al

Al Barsa, Jr.
Barsa Consulting Group, LLC

400>390

914-251-1234
914-251-9406 fax

http://www.barsaconsulting.com
http://www.taatool.com






                    Finucci Domenico
                    <Domenico.Finucci@Fid       To:     
"'midrange-l@midrange.com'" <midrange-l@midrange.com>
                    italia.it>                  cc:
                    Sent by:                    Subject:     R: Savlib with 
multiple libraries
                    midrange-l-admin@midr
                    ange.com


                    01/22/02 04:17 AM
                    Please respond to
                    midrange-l






This question has already been submitted: most problably the difference
depends from tape rewinding, as someone pointed out.
Sincerely

Domenico Finucci
Fiditalia , Milano, 02- 4301-2494


-----Messaggio originale-----
Da: oliver.wenzel@cibavision.novartis.com
[mailto:oliver.wenzel@cibavision.novartis.com]
Inviato: marted 22 gennaio 2002 10.09
A: MIDRANGE-L@midrange.com
Oggetto: Savlib with multiple libraries


Hello,

does anybody know the differences between a

   SAVLIB (LIB1 LIB2 LIB3)

and a

   SAVLIB (LIB1)  SAVLIB(LIB2)  SAVLIB (LIB3) ?

We have split up our nightly backup into two jobs - one saves all important
data libraries in a single SAVLIB, the other
takes care of the rest (reading the libraries from a file and doing a
SAVLIB
for each).

The save of the data libs (about15) has 50GB and takes 30 minutes, the
other
libraries (about 400) also have 50GB and
take 2hrs 15min.

The data libs also give the message "30000 locks exceeded..." - I guess it
first locks all objects in all libraries.

So, any ideas on the implications - performance? others?

Thanks,

Oliver

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