On Tue, 10 Apr 2012 08:16:56 -0400, Andy White <[email protected]> wrote:
>We had a problem on Monday morning which was a bit of a surprised. Over >the weekend we installed z/OS 1.13 on all of our remaining systems. > >Thought i'd pass along as a 'heads up'. We didn't see much about this in >any of the migration manuals or from SHARE we attended. My client is only running 1.13 in sandbox LPARs so far, but I alerted the storage team of this when I found it in the migration manual: 8.3.6 DFSMShsm: Stop using the HOLD command to quiesce activity prior to control data set backup Description: Before z/OS V1R13, you might have manually or programmatically held DFSMShsm activity using the HOLD command prior to starting a control data set (CDS) backup. Starting with z/OS V1R13, the ARCCAT resource is released by all functions running on z/OS V1R13 DFSMShsm hosts, and the functions are quiesced when CDS backup starts. Manually or programmatically holding DFSMShsm activity is no longer necessary. +------------------------------------------------------------------------+ ¦ Element or feature: ¦ DFSMShsm. ¦ +------------------------------------+-----------------------------------¦ ¦ When change was introduced: ¦ z/OS V1R13. ¦ +------------------------------------+-----------------------------------¦ ¦ Applies to migration from: ¦ z/OS V1R12 and z/OS V1R11. ¦ +------------------------------------+-----------------------------------¦ ¦ Timing: ¦ After the first IPL of z/OS ¦ ¦ ¦ V1R13. ¦ +------------------------------------+-----------------------------------¦ ¦ Is the migration action required? ¦ No, but recommended because ¦ ¦ ¦ DFSMShsm will automatically ¦ ¦ ¦ release the ARCCAT resource when ¦ ¦ ¦ a CDS backup is starts. ¦ +------------------------------------+-----------------------------------¦ ¦ Target system hardware ¦ Cross coupling facility (XCF) ¦ ¦ requirements: ¦ services are required to ¦ ¦ ¦ communicate the start of a CDS ¦ ¦ ¦ backup to all DFSMShsm hosts. XCF ¦ ¦ ¦ services must be available and ¦ ¦ ¦ configured properly. ¦ +------------------------------------+-----------------------------------¦ ¦ Target system software ¦ None. ¦ ¦ requirements: ¦ ¦ +------------------------------------+-----------------------------------¦ ¦ Other system (coexistence or ¦ None. ¦ ¦ fallback) requirements: ¦ ¦ +------------------------------------+-----------------------------------¦ ¦ Restrictions: ¦ The following are restrictions of ¦ ¦ ¦ taking this migration action. ¦ ¦ ¦ ¦ ¦ ¦ In a record-level sharing ¦ ¦ ¦ (RLS) CDS environment, all ¦ ¦ ¦ DFSMShsm hosts in the HSMPlex ¦ ¦ ¦ must be z/OS V1R13 or later ¦ ¦ ¦ hosts. ¦ ¦ ¦ ¦ ¦ ¦ In a non-RLS CDS environment, ¦ ¦ ¦ this migration action can be ¦ ¦ ¦ taken on z/OS V1R13 DFSMShsm ¦ ¦ ¦ hosts without changing hosts ¦ ¦ ¦ running on prior releases of ¦ ¦ ¦ z/OS. ¦ ¦ ¦ ¦ ¦ ¦ Some DFSMShsm environment ¦ ¦ ¦ configuration do not require ¦ ¦ ¦ XCF services. Specifically, ¦ ¦ ¦ a non-RLS CDS non-multiple ¦ ¦ ¦ address space DFSMShsm (MASH) ¦ ¦ ¦ configuration typically does ¦ ¦ ¦ not require XCF services. ¦ ¦ ¦ However, XCF services are ¦ ¦ ¦ required and must be ¦ ¦ ¦ available and configured in ¦ ¦ ¦ all DFSMShsm RLS CDS and MASH ¦ ¦ ¦ configurations. ¦ +------------------------------------+-----------------------------------¦ ¦ System impacts: ¦ If you continue to issue a HOLD ¦ ¦ ¦ command to quiesce DFSMShsm ¦ ¦ ¦ activity before a CDS backup and ¦ ¦ ¦ a corresponding RELEASE command ¦ ¦ ¦ to resume activity after CDS ¦ ¦ ¦ backup is complete, the only ¦ ¦ ¦ impact is that you will not see ¦ ¦ ¦ the performance benefit intended ¦ ¦ ¦ by this enhancement. ¦ +------------------------------------+-----------------------------------¦ ¦ Related IBM Health Checker for ¦ None. ¦ ¦ z/OS check: ¦ ¦ +------------------------------------------------------------------------+ Steps to take: On all z/OS V1R13 DFSMShsm hosts: 1. Remove the procedures, processes, or programs that issue the HOLD command to quiesce DFSMShsm activity prior to starting CDS backup. 2. Remove the corresponding procedures, processes, or programs that issue the RELEASE command to resume DFSMShsm activity after CDS backup completes. -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:[email protected] Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
