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Huawei SAN Storage Host Connectivity Guide for AIX
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HyperMetro Working Modes

HyperMetro Working Modes

Working Modes When OS Native Multipathing Is Used

Typically, HyperMetro works in load balancing or local preferred mode. These modes are valid only when the storage system and host both use ALUA. You are advised to set the host's path selection policy to round-robin (this is mandatory if HyperMetro works in load balancing mode). If the host does not use ALUA or its path selection policy is not round-robin, the host's multipathing policy will determine the working mode of HyperMetro.

HyperMetro storage arrays can be classified into a local and a remote array by their distance to the host. The one closer to the host is the local array and the other is the remote array.

Table 6-2 describes the configuration methods and application scenarios of the typical working modes.

Table 6-2 HyperMetro working modes

Working Mode

Configuration Method

Load balancing mode
  1. Enable ALUA on the host and set the path selection policy to round-robin.
  2. Configure an ALUA-supporting switchover mode for the initiators on both HyperMetro storage arrays. If multiple initiators are assigned to a host, this should be done for each of the initiators.
  3. Set the path type of the initiators on both storage arrays to optimal.

Local preferred mode
  1. Enable ALUA on the host. It is advised to set the path selection policy to round-robin.
  2. Configure an ALUA-supporting switchover mode for the initiators on both HyperMetro storage arrays. If multiple initiators are assigned to a host, this should be done for each of the initiators.
  3. Set the path type of the initiators on the local array to optimal and those on the remote array to non-optimal.

Other modes

Set the initiator switchover mode for the HyperMetro storage arrays by following instructions in the follow-up parts in this guide. The path type does not require manual configuration.

Working Modes When DMP Is Used

For DMP 7.1 and later versions, HyperMetro works in load balancing mode or local preferred mode. These typical working modes are valid only when both the storage system and host use ALUA. The default path selection policy is MinimumQ.

HyperMetro storage arrays can be classified into a local and a remote array by their distance to the host. The one closer to the host is the local array and the other is the remote array.

Table 6-3 describes the configuration methods and application scenarios of the typical working modes.

Table 6-3 HyperMetro working modes

Working Mode

Configuration Method

Load balancing mode
  1. Enable ALUA on the host and retain the default path selection policy (MinimumQ).
  2. Configure a switchover mode that supports ALUA for both HyperMetro storage arrays' initiators that are added to the host.
  3. Set the path type for both storage arrays' initiators to the optimal path.

Local preferred mode
  1. Enable ALUA on the host and retain the default path selection policy (MinimumQ).
  2. Configure a switchover mode that supports ALUA for both HyperMetro storage arrays' initiators that are added to the host.
  3. Set the path type for the local storage array's initiators to the optimal path and that for the remote storage array's initiators to the non-optimal path.

For DMP 6.0.x to DMP 7.0, set the switchover mode of the initiators on the storage arrays to ALUA not used.

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Updated: 2021-09-27

Document ID: EDOC1000162774

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