Managing throttles for volumes

You can create, modify, and remove throttles for volumes by using the management GUI or the command-line interface.

Throttling is a mechanism to control the amount of resources that are used when the system is processing I/Os on a specific volume or volume group. If a throttle is defined, the system either processes the I/O, or delays the processing of the I/O to free resources for more critical I/O.

Managing throttles with the command-line interface

To create a new throttle or edit an existing throttle for a volume with the command-line interface, enter the following command:

mkthrottle -type vdisk -bandwidth bandwidth_limit_in_mb -iops iops_limit -vdisk  vdisk_id_or_vdisk_name

where bandwidth_limit_in_mb is the maximum amount of bandwidth that the system can process for the specified volume before the system delays processing of I/O for that volume. The iops_limit is the maximum I/O operations per second that the system can process before the system delays the processing for this volume. The vdisk_id_or_vdisk_name is the ID or name of the volume that the throttle applies to.

To change an existing throttle for the volume, enter the following command:

chthrottle -type vdisk -bandwidth bandwidth_limit_in_mb -iops iops_limit throttle_name_or_id

where bandwidth_limit_in_mb is the maximum amount of bandwidth that the system can process for the specified host before the system delays processing of I/O for that volume. The iops_limit is the maximum I/O operations per second that the system can process before the system delays the processing for this volume. The throttle_id_or_name is the ID or name of the throttle that is being changed.

To remove a throttle for volume with the command-line interface, enter the following command:

rmthrottle throttle_name_or_id

where throttle_name_or_id is the ID or name of the throttle that is being removed.