Re: Revised GRS Entries with CON or EXCL requests

What tooling are bringing in that the vendor is going to be using TDMF, LDMF, FDRPAS, FDRMOVE or something else?

You definitely need to treat SYSVTOC and SYSZVVDS the same.
I convert all RESERVEs now but previously converted these two to reduce impacts of storage management activities. You are already doing a hardware RESERVE which is at the volume level. This change will eliminate the hardware RESERVE and replace it with a global enqueue. This is generally a good thing especially good if you are running in STAR mode with GRS. Basic or Paralell Sysplex? Ring or Star?

Best Regards,

Sam Knutson, GEICO
System z Performance and Availability Management
mailto:sknutson@xxxxxxxxx
(office) 301.986.3574

"Think big, act bold, start simple, grow fast..."



-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On Behalf Of Lizette Koehler
Sent: Saturday, September 06, 2008 10:52 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Revised GRS Entries with CON or EXCL requests

Oops - I forgot to add

We are z/OS V1.9 running 5 LPARs in a SYSPLEX all shared dasd.


A vendor has requested I update my GRS entries to the following statements:

    RNLDEF RNL(CON) TYPE(GENERIC) QNAME(SYSVTOC)
    RNLDEF RNL(CON) TYPE(GENERIC) QNAME(SYSZVVDS)
   
 
My current statements are:

RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(SYSZVVDS)
RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(SYSVTOC) 

I know from the Planning for GRS manual a CON: RESERVE requests should
result in only a global ENQ or a hardware reserve and a local (SYSTEM) ENQ.

And an EXCL should: Convert a SYSTEMS to SYSTEM request

Can anyone provide some insight as to what my impacts might be in making
this change? The vendor is going to be doing data set moves on my live
systems which will also be running a normal workload.

Will this cause reserves to cause me a problem at the volume level? My
concern is we are running with EXCL and they need us to run CON on VTOC and
VVDS. I would like to try and understand any impacts this type of change
could have.


Thanks for any input

Lizette

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