Chapter 5. Host configuration 281
In IBM Spectrum Virtualize, by default, no I/O throttling rate is set. However, I/O throttling can
be set at any of the following levels:
Host
Host clusters
Volume
MDisk group
When I/O throttling is set, the I/O rate is limited by queuing I/Os if it exceeds preset limits. I/O
throttling does not guarantee minimum performance. Internal I/Os such as FlashCopy,
Metro-Mirror, intra-cluster traffic are not throttled.
The following list illustrates some of the scenarios where I/O throttling can be beneficial:
An aggressive host hogging bandwidth of the Spectrum Virtualize system can be limited
by a throttle. For example, allow restricted I/Os from a data mining server than an
application server.
Restrict a group of hosts by their throttles. For example, department A gets more
bandwidth than department B.
Each volume can have a throttle defined. For example, a backup volume can have less
bandwidth than a production volume).
In this section, we illustrate the process of setting I/O throttle on already defined hosts and
host clusters.
Setting I/O throttle for host
To set I/O throttle on an already defined host, follow these steps:
1. Select the Hosts option under the Hosts section on the main panel, as shown in
Figure 5-113.
Figure 5-113 Hosts
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