RE: The RCLSTG mystery...

I don't know if I sent you any of these yet.   When was the last time we
did a reclaim storage?  

Just a thought...


Joe Giusto II
Patuxent Publishing Company
mailto:JGiusto@patuxent.com
http://www.lifegoeson.com <http://lifegoeson.com> 


        -----Original Message-----
        From:   acentea@forzani.com [SMTP:acentea@forzani.com]
        Sent:   Thursday, October 01, 1998 11:02 AM
        To:     MIDRANGE-L@midrange.com
        Subject:        Re: The RCLSTG mystery...

        Dan Rasch wrote: 

                What does RCLSTG accomplish, and is there a method to
predict it's outcome? ( ... )

        RCLSTG targets the logical level, not the physical one as
Microsoft SCANDISK does on PC's. It isolates damaged and lost objects
and tries to recover them. 

        It's a good tool since on a big system it's tricky to predict
how many damaged objects you may encounter. It should be a must for
heavy journalized systems, since many damaged objects regard the
receivers. 

        RCLSTG touches ownership and addressability too. A power failure
or an abnormal *IMMED job end can leave traces. If an *AUTL remains
damaged the real adresability of an object is affected, since a lot of
information gather to define it ( *AUTL, *USRPRF, *OBJD, ... ). The
RCLSTG will do a RCLAUTL that can enlighten or solve the bug. Not owned
objects are sent to QDFTOWN. 

        You may have other lost objects. Make a RTVDSKINF then a
PRTDSKINF. Page 1 gives you ' OBJ NOT IN A LIBRARY ' information. Page 3
gives you estimated space gain after RCLSTG. 

        You have a DTAARA somewhere in QUSRSYS ( QSYS ? ) to pick up
information about your system's last RCLSTG, to estimate the time
effort. IBM docs must explain somewhere the structure of this DTAARA. 

        Damaged objects are sent to LIB ( QRCL ). Study them, restore
useful ones and delete the others. If the size of those objects is
significant, RCLSTG can indeed improve the % of used storage. If nobody
cleaned QRCL after several RCLSTG, it's size could be increased. See in
page 3 of PRTDSKINF the actual size of your QRCL lib. Follow the rules
from the books : Sys Oper, Basic Backup & Basic Security if you need
recovery. 

        Be sure to have enough auxiliary storage for swapping operations
internal to RCLSTG. 

        Personally I use it every three months, as you also did. On all
CISC & RISC machines I met it ran no more than four hours, but the
system must be restricted so it requires ... another lost week-end if
you are in charge ...

        For a storage gain if you use big outputs, also consider
RCLSPLSTG. On old systems with little maintenance it will help. 
         

        Andre 
        _________________________ 
        acentea@forzani.com 
        centea@dsuper.net
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