EMC VMAX and DMX Symmetrix Storage Array recommendations for optimal performance on VMware ESXi/ESX

EMC recommends using a multipathing setting of Round Robin for the VMAX and DMX Symmetrix Storage Array families.

EMC also recommends setting the MP RR policy set for the I/O operation limit to a value of 1 for optimal performance with Symmetrix Storage Arrays. Currently, the VMware default value for this setting is 1000.

Note: Round Robin PSP is not supported for LUNs mapped by Microsoft Clustered RDMs in vSphere 5.1 and earlier versions. You have to use a different PSP or upgrade to vSphere 5.5.

To change the default policy setting from Fixed to Round Robin for EMC Symmetrix devices:

  1. Open the vSphere CLI (recommended) or the service console.
  2. Run this command:
    • ESXi 5.x
      # esxcli storage nmp satp set --default-psp=VMW_PSP_RR --satp=VMW_SATP_SYMM
    • ESXi/ESX 4.x
      # esxcli nmp satp setdefaultpsp --psp VMW_PSP_RR --satp VMW_SATP_SYMM

EMC recommends setting the path switching I/O operation limit to 1 for optimal performance with the EMC Symmetrix Family Storage Arrays (VMAX and DMX devices). Currently, the VMware default value for this setting is 1000.
To change the value if the I/O operation limit to 1:

  1. Open the vSphere CLI (recommended) or the service console.
  2. Run these commands:
    • ESXi 5.x
      To check the I/O operations limit:
      esxcli storage nmp psp roundrobin deviceconfig get --device=device_NAA
      To set the I/O operations limit:
      esxcli storage nmp psp roundrobin deviceconfig set --device=device_NAA --iops=1 --type iops
    • ESXi/ESX 4.x
      To check the I/O operations limit:
      esxcli nmp roundrobin getconfig --device=device_NAA
      To set the I/O operations limit:
      esxcli nmp roundrobin setconfig --device=device_NAA --iops 1 --type iops

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