You can create, modify, and remove throttles for hosts by using the management GUI or the
command-line interface.
Throttles are a mechanism to control the amount of
resources that are used when the system is processing I/Os on a specific host or host cluster. 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.
Using the management GUI
To create a new throttle for a specific host, complete these
steps:
- In the management GUI, select .
- Right-click a host or multiple hosts and select Edit Throttle....
- On the Edit Throttle page, enter values for the following throttles:
- Bandwidth Limit
- Enter the maximum amount of bandwidth the host can process before the system delays processing
for this host. Click Create.
- IOPS Limit
- Enter the maximum I/O operations per second the host can process before the system delays
processing for this host. Click Create.
To change an existing throttle, complete these steps:
- In the management GUI, select .
- Right-click a host cluster and select Edit Throttle....
- On the Edit Throttle page, enter values for the following throttles:
- Bandwidth Limit
- Enter the maximum amount of bandwidth the host can process before the system delays processing
for this host. Click Save.
- IOPS Limit
- Enter the maximum I/O operations per second the host can process before the system delays
processing for this host. Click Save.
To remove throttles for a specific host, complete these steps:
- In the management GUI, select .
- Right-click a host or multiple hosts and select Edit Throttle....
- On the Edit Throttle page, click Remove by the
throttle that you want to delete.
Using the command-line interface
To create a new throttle for bandwidth and IOPS for a host
with the command-line interface, enter the following
command:
mkthrottle -type host -bandwidth bandwidth_limit_in_mb -iops iops_limit -host host_id_or_host_name
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 host. The
iops_limit is the maximum I/O operations per second that the system can process
before the system delays processing for this host. The
host_id_or_host_name is
the ID or name of the host that the throttle applies to.
To change an existing throttle for the host, enter the
following
command:
chthrottle -type host -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 host. The
iops_limit is the maximum I/O operations per second that the system can process
before the system delays processing for this host. The
throttle_id_or_name is the
ID or name of the throttle that is being changed.
To remove a throttle for a host 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.