Cautions and restrictions for Server Priority Manager

Using Universal Volume Manager

Server Priority Manager monitors the I/O requests between the storage systems for Universal Volume Manager.

I/O requests issued from a port on the local storage system are not subject to the upper limit control, therefore I/Os are not restricted.

If you set the priority attribute to an external storage system port, all I/Os received on the port are controlled as the threshold control, and its performance data is added to the total number of I/Os of all prioritized ports. I/Os on the port will not be limited.

If you set the non-priority attribute to an external storage system port, I/O requests from the local storage system port are controlled as the upper limit value control, and I/Os on the port will be limited. On the other hand, I/O requests from a host are controlled by upper limit control, and I/Os on the port will be limited.

Real-time monitoring mode

Server Priority Manager cannot be started when Performance Monitor is in real-time mode. Before starting Server Priority Manager, ensure that Time Range in the Monitor Performance window is not set to Use Real Time.

Remote copy functions or global-active device

Server Priority Manager monitors the I/O requests between the storage systems for TrueCopy and Universal Replicator remote copy operations or global-active device.

I/O requests issued from a port on the primary storage system is not subject to the upper limit control, therefore I/Os are not restricted.

If you set the priority attribute to the storage system port at the secondary site, using the remote copy function (TrueCopy, Universal Replicator) or global-active device, all I/Os received on the port are controlled as the threshold control, and its performance data is added to the total number of I/Os (or the transfer rate) of all prioritized ports. I/Os on the port will not be limited.

If you set the non-priority attribute to the storage system port at the secondary site, using the remote copy function (TrueCopy, Universal Replicator) or global-active device, I/O requests from the storage system port at the primary site are not controlled by threshold control, and I/Os on the port will not be limited. On the other hand, I/O requests from a host are controlled by upper limit control, and I/Os on the port will be limited.

Statistics for storage system ports at the primary site

The I/O requests from the storage system ports at the primary site are not controlled by Server Priority Manager.

Settings on the Server Priority Manager main window

The Server Priority Manager main window has two tabs: the Port tab and the WWN tab. The settings on only one tab at a time can be applied to the storage system. If you make settings on both tabs, the settings cannot be applied at the same time. When you select Apply, the settings on the last tab on which you made settings are applied, and the settings on the other tab are discarded.

Using Command Control Interface

Server Priority Manager operations cannot be performed from the GUI and the CLI (HCS and CCI) at the same time. When you are using Server Priority Manager in Command Control Interface, you cannot perform the setting required for WWN monitoring. If you change some settings for Server Priority Manager from CCI, you cannot change Server Priority Manager and the monitoring WWN of Performance Monitor settings from the GUI. If you do, some settings might not appear. Before you change features that use Server Priority Manager, delete all Server Priority Manager settings from the currently used features.

To delete all settings specified from Device Manager - Storage Navigator, open the Server Priority Manager main window, and click either the Port or WWN tab, and then click the Initialize button to initialize the settings.

Connecting one HBA to multiple ports

If one host bus adapter is connected to multiple ports and you specify an upper limit of the non-prioritized WWN for one port, the specified upper limit value will be applied to the host bus adapter settings for other connected ports automatically.

Setting the connection between host bus adapter and port

To make setting for connecting the host bus adapter's WWN and the port, use the WWN tab of the Server Priority Manager main window. Alternatively you can use the Monitored WWNs tab of the Performance Monitor main window. Note that the monitored WWN name displayed in Performance Monitor is displayed as the SPM name in Server Priority Manager.

Differences of operations between Device Manager - Storage Navigator and CCI

There are differences in operations for SPM information between Device Manager - Storage Navigator and CCI. The table below describes the differences. For details, see the Command Control Interface User and Reference Guide and the Command Control Interface Command Reference.

Operation target	Operation for SPM information	Device Manager - Storage Navigator	CCI
Operation target	Operation for SPM information	Can be performed?	Can be performed?	Command Example
Port	Configure	Yes	No	-
	Delete	Yes	No	-
	Obtain	Yes	No	-
WWN	Configure	Yes*	Yes*	raidcom modify spm_wwn
	Delete	Yes*	Yes*	raidcom delete spm_wwn
	Obtain	Yes*	Yes*	raidcom get spm_wwn
LDEV	Configure	No	Yes	raidcom modify spm_ldev
	Delete	No	Yes	raidcom delete spm_ldev
	Obtain	No	Yes	raidcom get spm_ldev
* For Fibre Channel only.

When you perform one or more of the following operations, the upper limit value control might be disabled for about two minutes:

Adding, replacing, or removing cache memory

Changing the system configuration

Updating the firmware

Replacing the controller (CTL)

Adding, replacing, or removing CHB

Powering on and off the storage system

The upper limit value control might be disabled when an abnormal condition occurs, such as a network failure or damage to the HBA or Fibre cable, as these conditions can cause the login or logout of the host. Resolve the cause of the unexpected login/logout behavior and then enable the upper limit value control.