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Dell PowerStore Protecting Your Data

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Configure host connectivity

NOTE:Host support is provided for VMware vSphere metro storage cluster. Both Fibre Channel and iSCSI connectivity are supported.
NOTE:As of PowerStore version system 4.x, host support is provided for Windows and Linux hosts.

Host metro connectivity is configured on a local and remote PowerStore systems and enables hosts and applications to perceive physical volumes from the two systems as a single volume. When you configure metro connectivity for the host, select the preferred array to determine which system retains access to the storage if failure occurs.

A host (ESXi, Windows, or Linux) must be defined on both the local and remote systems to enable host metro connectivity.

When you create a host, the Add Host wizard enables you to set the host connectivity:

NOTE:The host connectivity options are graphically demonstrated in the Add Host wizard.
  • Local Connectivity - Provides host access only to the local system.
    NOTE:Local connectivity can also be used with metro volumes.
  • Metro Connectivity - Provides host access to both local and remote systems. If you select this option, set system access:
    • Host is co-located with this system - Host path latency is lower for the local system and higher for the remote system. The host always attempts to send I/Os to the local system (except for when the local system is down).
    • Host is co-located with the remote system - Host path latency is lower for the remote system. The host always attempts to send I/Os to the remote system (except when the remote system is down).
    • Co-located with both systems - Latency and performance of host path are equal for both local and remote systems. The host sends I/Os to the local or remote systems, based on its multipath considerations.
NOTE:Regardless of the configured connectivity, all ESXi hosts must be configured on the same vCenter cluster.
NOTE:For an ESXi host mapped to a metro volume, it is recommended to use round robin Path Selection Plugin (PSP) with latency mode enabled.
NOTE:In case one of the systems goes offline, the ESXi host enters an All Paths Down (APD) condition. To resolve this condition, it is recommended to configure vSphere HA. This configuration enables virtual machines on available ESXi hosts to restart and resolve the APD condition.

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