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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Restrictions: Cascaded operations

  • An R21 device cannot be paired with another R21 device

    R1 -> R21 -> R21 -> R2 is not supported.

  • R21 devices cannot be BCV devices or PPRC devices.
  • R21 devices are supported only on GigE and Fibre RAs.
  • If the first device added to an SRDF group is in asynchronous mode (-rdf_mode async), all subsequent devices added to the SRDF group must also be added in asynchronous mode.
  • If you do not specify a mode, the option file setting SYMAPI_DEFAULT_RDF_MODE is used. The default is adaptive copy.
  • If the device to be the R21 device is currently an R1 device, and is in synchronous or adaptive copy write pending mode, creation of the R1 -> R21 relationship is blocked.

    For diskless devices, creation of an R1 device operating in adaptive copy disk is blocked.

    Diskless devices are not supported on arrays running HYPERMAX OS.

  • If both SRDF groups for the R21 device are not on a Fibre or GigE director, creation of an R21 device is blocked.
  • The same SRDF group cannot be configured for both R21 device mirrors.

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