How to change Round Robin IOPS limit from default to 1

 

Recently while working with storage team, as they suggested to IOP limitation value as 1.

Modifying the IOPS limitation to 1 will improve performance where an active storage path might have several queued I/O's.

> Login SSH on Esxi host.

Run the following command to list all of the storage SCSI devices:- 

# esxcli storage nmp device list | grep naa

Get info about a LUN by running the below command on one of you LUN IDs :-

# esxcli storage nmp device list -d naa.6589cfc00000067896666120478ie89

Verify the change using the following command:-

# esxcli storage nmp device list

To configure Round Robin, I/O operations from 1,000 (the default value) to 1, login into the ESXi console and run the following command (with the .xxxx in naa.xxxx matching the first few characters of your NAA ID):

# for i in `esxcfg-scsidevs -c |awk '{print $1}' | grep naa.xxxx`; do esxcli storage nmp psp           roundrobin deviceconfig set --type=iops --iops=1 --device=$i; done

Verify the change using the following command:-

# esxcli storage nmp device list

Note: You do not need to restart the host for the changes to take effect.

Reference:

Adjusting Round Robin IOPS limit from default 1000 to 1 (vmware.com)