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Setting Upper-Limit Values for Non-Prioritized WWNs
After you analyze traffic statistics about prioritized WWNs and non-prioritized
WWNs, you must set upper limit values to I/O rates or transfer rates for non-
prioritized WWNs. Upper limit values for I/O rates are used to suppress the
number of I/Os from the low priority host servers and thus provide better
performance for high-priority host servers. Upper limit values for transfer rates
are used to suppress the amount of data that should be transferred between
the storage system and the low priority ports, thus providing better
performance for high-priority host servers.
Tip: To set the same upper limit value to more than one non-prioritized WWN,
use an SPM group. For details on SPM groups, see Grouping Host Bus
Adapters.
To limit the I/O rate or transfer rate of a non-prioritized WWN:
1. Start Server Priority Manager.
The Server Priority Manager window is displayed.
2. Ensure that the WWN tab is displayed.
3. Do one of the following:
– To limit the I/O rate of the non-prioritized WWN, select IOPS from the
list at the upper left corner.
– To limit the transfer rate of the non-prioritized WWN, select MB/s from
the list at the upper left corner.
4. In the upper-left tree, click the icon of the port whose traffic you want to
limit below the Subsystem folder.
The information about the host bus adapters which connect to the selected
port is displayed in the list.
5. Locate the non-prioritized WWN in the list.
Notes:
The Attribute column of the list indicates whether WWNs are prioritized or
non-prioritized. The Attribute column of a non-prioritized WWN
displays Non-Prio.
If you cannot find any non-prioritized WWN in the list, check the list at the
top right corner of the window. If the list displays Prioritize, select All
or Non-Prioritize.
6. Do one of the following:
– To limit the I/O rate of the non-prioritized WWN, double-click the
desired cell in the IOPS column in Upper. Next, enter the upper limit
value in the cell.
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Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
Server Priority Manager Operation
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