HP StorageWorks XP Performance Advisor Software v4.6 User and Troubleshooting Guide (T1789-96094, June 2010)

IMPORTANT:
Following are important notes on real-time performance data collection:
You can configure only one instance of real-time performance data collection for an XP array,
through the connected host agent. You cannot use the same host agent for another real-time per-
formance data collection until the current collection stops. The following error message is displayed:
The selected host agent is already in use for other real time collec-
tion. Please select any other available host agent.
However, if an XP array is connected to two host agents, you can configure separate real-time
data collection through both of them.
Real-time performance data collection cannot happen for a combination of resources, like LDEVs
and RAID groups that belong to the same XP array or multiple XP arrays.
If you are not able to connect to the real-time host agent, the following error message is displayed:
Performance Advisor could not recognize the Real Time Server on the
host agent <host agent name>. This could be due to the Real Time
Server not running on the selected host agent or the host agent name
is not found.
It may be due to the following reasons:
Real-time service is not running on the selected host agent.
XP Performance Advisor host agent is not responding to your requests, as the specified host
name does not exist.
To overcome the issue, perform the following steps:
1. Verify if the host agent name displayed in XP Performance Advisor is correct. This can be
done by pinging the host agent to see if it is responding to your requests. You should enter
the fully qualified domain name ([servername].[domain name]) of the host agent in the
command prompt window. You can get the fully qualified domain name from the HostAgent
list on the RealTimeChart screen.
2. Verify if the real-time server (HP XP Performance Advisor RealTime Server) is running on the
host agent. Restart the service if it has stopped.
If you try to connect to a host agent through an instance of XP Performance Advisor and that host
agent is already collecting real-time data initiated through another instance of XP Performance
Advisor, the existing connection is discontinued and the following error message is displayed:
Error occurred while connecting to Real Time Server. This could be
due to the Real Time Server not running on the host agent or the same
host agent is already being used for real time collection by another
instance of Performance Advisor.
Hence, at a given point in time, ensure that only one instance of XP Performance Advisor collects
real-time performance data for an XP array through the respective host agent.
Real-time performance graphs are not displayed for LDEVs and RAID groups that are currently
not processing any IO requests (called as unused resources).
Case 1: You select three LDEVS, 00:00, 00:01 and 00:02 for which you want to plot real-time
performance graphs, and out of these LDEVs, 00:02 is an unused LDEV. Hence, the real-time
graphs are displayed only for 00:00 and 00:01 LDEVs.
Case 2: You select only one LDEV, 00:02 that is currently an unused resource. The Real-
TimeChart screen displays the following message:
The selected component does not have any activity happening cur-
rently or is no longer present in the XP array.
HP StorageWorks XP Performance Advisor Software User Guide 69