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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Control and set restrictions for diskless devices in cascaded SRDF

You can perform SRDF control and set operations for diskless environments on composite groups, device groups, and files that contain both diskless and non-diskless devices.

NOTE:

You can control SRDF pairs with diskless devices and without diskless devices in a single control operation if some of the R21 devices in the group are diskless and others are not.

  • The following configurations are supported when the R21 is a diskless SRDF device:
    • R1->R21->R2
    • R11->R21->R2
    • R11->R21->R22
  • You cannot set the mode for an SRDF group containing diskless and non-diskless devices to asynchronous.

    SRDF modes in cascaded configurations lists the modes allowed for cascaded SRDF configurations.

    SRDF modes in cascaded configurations with EDP lists the modes allowed for cascaded SRDF configurations where the R21 is diskless.

    All other combinations are blocked. If synchronous mode is not allowed, specify a valid SRDF mode when creating these device pairs

    NOTE:

    The adaptive copy write pending -> asynchronous combination in SRDF modes in cascaded configurations with EDP cannot reach the Consistent state. The R21->R2 hop hangs in the SyncInProg state with 0 invalid tracks. To have the R2 reach the Consistent state in an R1->R21->R2 setup, configure synchronous -> asynchronous.

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