Cluster Server 7.4 Agent for EMC SRDF Configuration Guide - Windows

Last Published:
Product(s): InfoScale & Storage Foundation (7.4.1)
Platform: Windows
  1. Introducing the agent for EMC SRDF
    1.  
      About the agent for EMC SRDF
    2.  
      Supported hardware for EMC SRDF
    3.  
      Supported software
    4.  
      Typical EMC SRDF setup in a VCS cluster
    5. EMC SRDF agent functions
      1.  
        About the EMC SRDF agent's online function
      2.  
        About dynamic swap support for the EMC SRDF agent
    6.  
      Installing the agent for EMC SRDF
  2. Configuring the agent for EMC SRDF
    1. Configuration concepts for the EMC SRDF agent
      1.  
        Resource type definition for the EMC SRDF agent
      2. Attribute definitions for the SRDF agent
        1.  
          Required attributes
        2.  
          Optional attributes
        3.  
          Internal attributes
      3.  
        Sample configuration for the EMC SRDF agent
    2. Before you configure the agent for EMC SRDF
      1.  
        About cluster heartbeats
      2.  
        About configuring system zones in replicated data clusters
      3.  
        About preventing split-brain
    3. Configuring the agent for EMC SRDF
      1. Configuring the agent manually in a global cluster
        1.  
          Configuring the Symm heartbeat on each cluster
      2.  
        Configuring the agent manually in a replicated data cluster
      3.  
        Setting the OnlineTimeout attribute for the SRDF resource
      4.  
        Additional configuration considerations for the SRDF agent
  3. Testing VCS disaster recovery support with EMC SRDF
    1. How VCS recovers from various disasters in an HA/DR setup with EMC SRDF
      1.  
        Failure scenarios in global clusters
      2.  
        Failure scenarios in replicated data clusters
    2.  
      Testing the global service group migration
    3.  
      Testing disaster recovery after host failure
    4.  
      Testing disaster recovery after site failure
    5.  
      Performing failback after a node failure or an application failure
    6.  
      Performing failback after a site failure
  4. Setting up fire drill
    1.  
      About fire drills
    2.  
      Fire drill configurations
    3. About the SRDFSnap agent
      1.  
        SRDFSnap agent functions
      2.  
        Resource type definition for the SRDFSnap agent
      3.  
        Attribute definitions for the SRDFSnap agent
      4.  
        About the Snapshot attributes
      5.  
        Sample configuration for a fire drill service group
    4.  
      Additional considerations for running a fire drill
    5.  
      Before you configure the fire drill service group
    6. Configuring the fire drill service group
      1.  
        About the Fire Drill wizard
    7.  
      Verifying a successful fire drill

About dynamic swap support for the EMC SRDF agent

The agent supports the SRDF/S and SRDF/A dynamic swap capability. The agent performs a role swap for the healthy arrays that are configured for dynamic swap when a service group fails over between the arrays. If one array is down, a unilateral read-write enable occurs. The agent fails over the device groups that are not configured for dynamic swap using the following command: symrdf failover. The command enables read-write on the R2 device.

If the SwapRoles attribute is set to 1, the agent checks the following criteria before determining if a swap occurs:

  • All devices in the device group are configured as dynamic devices.

  • Dynamic RDF is configured on the local Symmetrix array.

  • The microcode is level 5567 or later.

If the SwapRoles attribute is set to 2, the agent does not check for any criteria and directly initiates the role swap between the dynamic devices.

The commands for online are different for SRDF/S dynamic swap and SRDF/A dynamic swap as follows:

  • For SRDF/S, for R2 devices in the SYNCHRONIZED state, the agent runs the symrdf failover -establish command.

  • For SRDF/A, for R2 devices in the CONSISTENT state, the agent runs the symrdf -force failover command. If consistency is enabled, the agent runs the symrdf disable command. The agent then issues the symrdf swap command to do the role-swap and the establish command to re-establish the replication, and re-enables the consistency.

Dynamic swap does not affect the ability to perform fire drills.