280 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
4. Select the desired mappings via the radio button. In our example, we chose to Remove
Mappings, as shown in Figure 5-111.
Figure 5-111 Remove mappings after host cluster deletion
5. Click Delete Host Cluster.You see a window indicating that the task completed
successfully, as shown in Figure 5-112.
Figure 5-112 Host Cluster deletion task completed
6. Click Close.
5.6.8 I/O throttling for hosts and Host Clusters
You can set a limit on the number of I/O operations that are accepted by the storage system.
The limit is known as the throttling rate and is set in terms of I/O operations per second
(IOPS) or bandwidth. I/O throttling is a way to achieve quality of service (QoS). I/O throttling is
a mechanism to limit the volume of I/O processed by the storage system at various levels
resulting in better distribution of storage system resources. I/O throttling is also referred to as
I/O governing.
Warning: Selecting Remove Mappings to remove all the shared mappings if the host or
hosts that are being removed no longer require access to these volumes. So exercise this
option with caution, otherwise the server or servers that are part of the host cluster lose
access to all the shared volumes.
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