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ESXi 5.x -> ESXi 6.x How to properly tune an ESXi server that is connected to a Symmetrix. Degraded performance is seen on new or existing ESXi servers zoned to Symmetrix storage arrays. Degraded performance on an ESXi server attached to a DMX, VMAX, or VMAX3 array Note: This does not solely apply to newly implemented servers.
A tunable setting for VMware's Native Multipathing (NMP) Round Robin (RR) policy is incorrectly set or is still set to the default value of 1000.
The NMP RR policy I/O operations limit should be set to a value of "1" when attached to a Symmetrix. For ESX/ESXi 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 For ESXi 5.x: To check the I/O operation 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
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