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 or later. For more information about various pathing policies, see
Multipathing policies in ESXi 5.x and ESXi/ESX 4.x (1011340).
To change the default policy setting from
Fixed to
Round Robin for EMC Symmetrix devices:
- Open the vSphere CLI (recommended) or the service console.
- Run this command:
- ESXi 5.x/6.0
# 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:
- Open the vSphere CLI (recommended) or the service console.
- Run these commands:
- ESXi 5.x/6.0
Run this command to check the I/O operations limit:
esxcli storage nmp psp roundrobin deviceconfig get --device=device_NAA
Run this command 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
Run this command to check the I/O operations limit:
esxcli nmp roundrobin getconfig --device=device_NAA
Run this command to set the I/O operations limit:
esxcli nmp roundrobin setconfig --device=device_NAA --iops 1 --type iops