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Add support for Cascading FlashCopy for COPY command with FASTREP(REQ) - see PTF UI172348


We take daily System Level backups (SLB) of our SAP production environments using the BACKUP SYSTEM utility.

We use Incremental FlashCopy to reduce the amount of data that needs to be physically copied to the FlashCopy target volumes and limit the pressure on the DASD subsystem.

We regularly perform Clones from our production systems into other systems, using the production FlashCopy disks as the source.

We use the COPY command with FASTREP(REQ) to guarantee that FlashCopy will be used.

Pain point:

We have to break the incremental relationship between the real production disks and their FlashCopy targets to allow us to perform the Clone. If we don't, we get the following type of error message when running the Cloning Tool COPY command:




Having to break the incremental relationship causes:

(1) operational complexity

(2) negative impact on our application workloads during the next SLB as it will force a full physical background copy.

We meet all the prerequisites to exploit Cascading FlashCopy i.e. Clone without having to end the incremental relationships in the source system (see scenario 3b in attached document).

If we issue the COPY command with FASTREP(REQ) ourselves using ADRDSSU, the command runs successfully.

If we run the Cloning Tool with FASTREP(PREF), the COPY command runs successfully and uses FlashCopy -- but we do not want to use FASTREP(PREF) as it doesn't guarantee that FlashCopy will be used.

If we run the Cloning Tool with FASTREP(REQ), we are blocked by the initial check that looks for existing relationships.

  • Guest
  • Oct 12 2020
  • Delivered
Who would benefit from this IDEA? Any user of the Cloning Tool using SLB as the source and running on recent disk hardware
How should it work?

The check for existing relationships performed before COPY command with FASTREP(REQ) should be relaxed to tolerate relationships that do not block cascading FlashCopy

Idea Priority Medium
Client Name Nationwide Building Society
  • Attach files
  • Guest commented
    9 Dec, 2020 07:24pm

    Thanks Jane :-)

  • Admin
    Jane Chan commented
    9 Dec, 2020 07:20pm

    Please reference PTF UI17348. @ Florence, as part of the system mechanics we had to move status to planned before we could mark it as shipped.

  • Guest commented
    9 Dec, 2020 06:20pm

    As noted by 'Guest' in the comment area, APAR PH29209 (closed) brings 'Db2 subsystem cloning supports cascading FlashCopy in its volume pairing algorithm'. Isn't that going to provide a solution for this request ?

  • Guest commented
    22 Oct, 2020 09:19am

    This enhancement will be delivered in PH29209 APAR.

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