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Adding new disk devices to existing Mainframe configuration



1. Update and build IODF

2. Update and build IOCDS

3. Prepare and start IPL


An easy way  to add   new   formatted   LCU and newly created Device addresses   to  existing  Mainframe  configuration (if a ESS800 shark storage is available)   is described below. The first step is to update and create  IODF  work configuration with the added  LCU and newly created Devices   followed by IODF  building  (using HCD or JCL technology). The next step is to build the new IOCDS configuration (by  HCD or HMC technology)  using the updated IODF  work configuration followed by IPL prepare before starting the modified system configuration. The  new IOCDS is used at POR (Power Off Reset) time  before IPL to make the new configuration data known to z/OS .


1. Update and build IODF

For HCD technology follow  the link ZOS production  IODF configuration  display/ create/ change using ISPF and create a new work IODF based on the current  production IODF (copied under  a new   name  “” selecting ISPF –  HC6(Maintain I/O definition files) – 2(Copy I/O definition file) . Add the  new   control units (if =3A00/3B00) in the HC –  1 – 4 menu selections  using  F11.  Add   the new devices (if =500,256/600,256) in the HC –  1 – 5 menu selections  using  F11 and select the action Add like. To build IODF select  HC-2-1 (Build production I/O definition file)  as shown in Case3 of the upper  link. The new IODF is saved on BC2MCC  (IODF device  with  address 644) as sys1.iodf39.

For JCL technology follow  the link ZOS  test  IODF configuration  display/ create/ change-consoles/ add- disks  using JCL source library to create  new JCL executable library member   IODEF42 copying  source member MVSIO42 with  added  New  disk volume addresses (500 and 600)  to  New control units  (3A00 and 3B00)  as follows:

CNTLUNIT CUNUMBR=3A00,PATH=(25,27),                                                   X


IODEVICE UNIT=3390,ADDRESS=(0500,256),CUNUMBR=(3A00),                 X


CNTLUNIT CUNUMBR=3B00,PATH=(25,27),                                                     X


IODEVICE UNIT=3390,ADDRESS=(0600,256),CUNUMBR=(3B00),                  X


After execution of  the submitted member IODEF42,   the IODF  file Sys1.iodf42  is created on IODF deviceBC2MCC.

2. Update and build IOCDS

For the HCD technology follow  the link  ZOS  IOCDS  build or change  using HCD of ISPF  and enter  – HC – 2(Activate or process configuration data) 2(Build IOCDS specifying  the name of the new created IODF file ‘SYS1.IODF39′   to be used and continue with Build IOCDS function. Then you have to perform some  Actions on selected IOCDS configuration(A0, A1, A2..) –   Update IOCDS and  writing/rename  the title  and date of the changed configuration.  A  job is generated “CRIOCDS  JOB07466 “  that is  submitted,  but not started. On syslog (sd.log) you have to answer/ REPLY     ‘YES’  for  the  job  “CRIOCDS”  to WRITE TO LEVEL A0 IOCDS or A1 IOCDS which  is choosen  to be replaced (“Disable write protection” for this  IOCDS  must be activated from HMC/Hardware Management Console/).

For the HMC  technology go to link ZOS  IOCDS  data set  creation  using Hardware Management Console  and  add  to the existing   configuration file   the following statements with the new CUNUMBR=(3A00/3B00) and IODEVICE ADDRESS=(500,256)/(600,256) as follows:



Different  function options exist for the choosen  I/O configuration (IOCDS).   To view or edit the active  A0 configuration you have to “Disable write protection”, to “Disassemble data set”,  then “Open source file”  and save it. Enter “Build data”  function to create  IOCDS  as A0 and exit to finish operations. You may write a new A0 configuration generated by HMC only if  “Disable write protection“  function option for  the selected  configuration is activated.

After the new  IOCDS is made active  it is necessary from HMC to start  task list – CPC Recovery  – POR (Power Off Reset)  to make the new configuration data ready  for IPL.


3. Prepare and start IPL

3.1. IPL preparation

Before IPL it is necessary to prepare a special LOAD39 member  in library sys1.iplparm  as shown in case 4.1   following the  link  ZOS production  IODF configuration  display/ create/ change using ISPF where  it  is pointed IODF39 to be used  during IPL.

In sys1.parmlib(commnd00)  library member  should be added “‘comm=’v 500-5ff,online’/ comm=’v 600-6ff,online” if  IODF is created with parameter “offline YES’ for addresses 500 and 600.

3.2. Start IPL

To start IPL follow the HMC /Hardware Management Console/ IPL Operations described   below:

START SYSTEM ACTIVITIES  –  IPL  for LPAR=BC2A, go to – task list – CPC Recovery  –  Load:

Load address:  0640 – (from /d iplinfo: “IPL DEVICE 0640 VOLUME BC2RIC”)

Load parameter:  064439 – (from /d iplinfo: “IODF DEVICE 0644”  of  VOLUME BC2MCC, “USED LOAD39 IN SYS1.IPLPARM ON 0644”   for  sys1.iodf39 on    VOLUME BC2MCC)

After   IPL  is finished  the new added disk devices could be verified  (Find) with their  volume names and physical  addresses using the following  ISPF  menu selections   – p.6 – rmf – 2 – 2  – 3. The next actions  should  be to distribute the new added disk space among the LPARS and the applications.

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