Customizing Round Robin Setup

You can use the

esxcli storage nmp psp roundrobin

commands to set round robin path options on a device controlled by the

VMW_PSP_RR

PSP.

Specifying and Customizing Round Robin Path Policies

You can use

esxcli storage nmp

commands to set path policies. Specify one of the options listed in Connection Options for ESXCLI Host Management Commands in place of

<conn_options>

Set the path policy to round robin.

esxcli <conn_options> storage nmp device set --device naa.xxx --psp VMW_PSP_RR

Specify when to switch paths.

You can choose the number of I/O operations, number of bytes, and so on. The following example sets the device specified by

--device

to switch to the next path each time 12345 bytes have been sent along the current path.

esxcli <conn_options> storage nmp psp roundrobin deviceconfig set --type "bytes" -B 12345 --device naa.xxx

The following example sets the device specified by

--device

to switch after 4200 I/O operations have been performed on a path.

esxcli <conn_options> storage nmp psp roundrobin deviceconfig set --type=iops --iops 4200 --device naa.xxx

The

esxcli storage nmp psp roundrobin deviceconfig get

command retrieves path selection settings for a device that is using the

roundrobin

PSP. You can specify the device to retrieve the information for.

Options	Description
-d <device> --device <device>	Device to get round robin properties for.

The

esxcli storage nmp psp roundrobin deviceconfig set

command specifies under which conditions a device that is using the

VMW_PSP_RR

PSP changes to a different path. You can use

--bytes

--iops

to specify when the path should change.

Options	Description
--bytes -B	Number of bytes to send along one path for this device before the PSP switches to the next path. You can use this option only when --type is set to bytes.
--device -d	Device to set round robin properties for. This device must be controlled by the round robin ( VMW_PSP_RR ) PSP.
--iops -I	Number of I/O operations to send along one path for this device before the PSP switches to the next path. You can use this option only when --type is set to iops .
--type -t	Type of round robin path switching to enable for this device. The following values for type are supported. bytes : Sets the trigger for path switching based on the number of bytes sent down a path. default : Sets the trigger for path switching back to default values. iops : Sets the trigger for path switching based on the number of I/O operations on a path. An equal sign (=) before the type or double quotes around the type are optional.
--useANO -U	If set to 1, the round robin PSP includes paths in the active, unoptimized state in the round robin set. If set to 0, the PSP uses active, unoptimized paths only if no active optimized paths are available. Otherwise, the PSP includes only active optimized paths in the round robin path set.