Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

SRDF/Metro

5876 arrays with the applicable ePack can participate only as Witness arrays in SRDF/Metro configurations.

Witness SRDF groups can be created between two VMAX3 arrays running HYPERMAX OS 5977.691.684 or later and a 5876 array.

An SRDF/Metro configuration between the two VMAX3 arrays can then use Witness protection, provided by the 5876 array.

Solutions Enabler 8.0.1

You can use SRDF features in Solutions Enabler 8.0.1/HYPERMAX OS to replicate to/from:

• VMAX 3 arrays also running HYPERMAX OS.
• VMAX 10K/20K/40K arrays running Enginuity 5876 with the applicable ePack.

When one array in an SRDF configuration is running HYPERMAX OS, and one or more other arrays are running Enginuity 5876, the following rules and restrictions apply:

• All SRDF groups and devices must be dynamic.
• SRDF/A sessions use legacy mode. See SRDF/A cycle modes.
• Directors on arrays running HYPERMAX OS support up to 16 ports and 250 SRDF groups. If a port on the array running HYPERMAX OS is connected to an array running Enginuity 5876:
  • The port supports a maximum of 64 RDF groups.
  • The director associated with the port supports a maximum of 186 RDF groups.
• SRDF device pairs with meta-devices on one side are allowed if the meta-devices are on the array running Enginuity 5876.

  Output of the symrdf query, symrdf list, and symdev show commands has been enhanced to display RDF mode as MIXED when a meta head device on an array running Enginuity 5876 has different RDF modes than its members.

  When you see a device in MIXED mode, you can use the set mode command to choose the appropriate mode for the device pair.

• The symcfg list -ra command has been modified to report the remote SID when the RDF Pair State is Partitioned.
• Adaptive copy write pending is not supported in HYPERMAX OS.
  • For swap and failover operations - If the R2 device is on an array running HYPERMAX OS, and the mode of the R1 is adaptive copy write pending, SRDF sets the mode to adaptive copy disk.
  • For migrate -replace R1 operations - If the R1 (after the replacement) is on an array running HYPERMAX OS, and the mode of the R1 is adaptive copy write pending mode, SRDF sets the mode of the migrated pair to adaptive copy disk.