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 management GUI
To create a new throttle or edit an existing throttle for a specific
volume, complete these steps:
- In the management GUI, select .
- Right-click a volume and select Edit Throttle.... Note: You can select multiple volumes to apply throttles to more than one volume.
- On the Edit Throttle page, enter values for the following throttles:
- Bandwidth Limit
- Enter the maximum amount of bandwidth the volume can process before the system delays the processing for this volume. Click Create.
- IOPS Limit
- Enter the maximum I/O operations per second the volume can process before the system delays the processing for this volume. Click Create.
To edit an existing throttle for a specific volume, complete these steps:
- In the management GUI, select .
- Right-click a volume and select Edit Throttle....
- On the Edit Throttle page, enter values for the following throttles:
- Bandwidth Limit
- Enter the maximum amount of bandwidth the volume can process before the system delays the processing for this volume. Click Save.
- IOPS Limit
- Enter the maximum I/O operations per second the volume can process before the system delays the processing for this volume. Click Save.
To remove throttles for a specific volume, complete these steps:
- In the management GUI, select .
- Right-click a volume or multiple volumes and select Edit Throttle....
- On the Edit Throttle page, click Remove by the throttle that you want to delete.
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.