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# View host I/O limits

Storage hosts are systems that use storage system LUN resources. A logical unit number (LUN) is an identifier that is used for labeling and designating subsystems of physical or virtual storage.

## Steps

1. Select the storage system.
2. Select Hosts > Port Groups.
3. Select the port group and click .
4. Click the link in the Host I/O (IO/Sec) or Host I/O (MB/Sec) fields.

   The following properties display:

   Storage Group—Storage group on which the limit is set.

   Quota State—Whether the limit is set directly on the storage group (Defined) or through a cascaded relationship (Shared).

   Dir:Port—Storage system director and port in the port group.

   Host I/O Limit (MB/Sec)—Total host I/O limit on the listed port in MB/Sec. This value is the I/O limit of the associated port group that is divided across its ports.

   Host I/O Limit (IO/Sec)—Total host I/O limit on the listed port in I/O/Sec. This value is the I/O limit of the associated port group that is divided across its ports.

   Child Host I/O Limit (MB/Sec)—Total child host I/O limit on the listed port in MB/Sec. This value is the I/O limit of the associated port group that is divided across its ports.

   Child Host I/O Limit (IO/Sec)—Total child host I/O limit on the listed port in I/O/Sec. This value is the I/O limit of the associated port group that is divided across its ports.