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Any consideration to use IBM Z subchennel set 1 for DS8K GM B volumes ?

  • 1.  Any consideration to use IBM Z subchennel set 1 for DS8K GM B volumes ?

    Posted Thu May 12, 2022 09:08 AM

    I sent the same query to Diskcore, but it' s may be better to put here.
    We are now going to propose to use Subchannel set 1 for DS8K GM B volumes and Subchannel set 2 for thin provisioned GM C volumes in DS8950Fs due to the address constraint in a DR systems. The customer will have D volumes defined as Subchannel set 0, which are used for their DR systems. They are now managing GM with old DS8886s via their own created TSO scripts and they have a plan to expand their GM A volumes and they will use them in the new DS8950F environment too. I believe it's no problem to use the subchannel set 1 or 2 for GM B volumes, but I'd like to confirm and would like to know any consideration if you have experienced. I tested at our lab that it works and we can FlashCopy FRR, etc with subchannel set 1 and 2 environment, but it seems to me that GDPS/GM doesn't support to use subchannel set 1/2/3 for GM B volumes. So, I'd like to check.

    Warm regards,

    Shin



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    SHIN TAKATA
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