Dell 651F Two-Way Radio User Manual


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SAN Performance Tuning 17-1
CHAPTER 17
SAN Performance Tuning
This chapter provides information and instructions for improving the performance of
the various storage area network (SAN) components in your network. All procedures
in this document require administrator access permissions.
This chapter provides information about the following components:
• Dell OpenManage Data Managed Node Data Agent for 650F and 651F storage
systems
• Running multiple copies of Data Managed Node Data Agent in a SAN
• RAID considerations for 650F and 651F storage systems
• Cache size for 650F and 651F storage systems
• Setting the execution throttle
• Setting the PowerVault 650F and 651F cache water mark
• Network timeouts
Dell OpenManage Data Managed Node
Data Agent for 650F and 651F Storage
Systems
When the Dell OpenManage Application Transparent Failover (ATF) software is not
installed, the Dell OpenManage Data Managed Node Data Agent’s commands for
polling and configuring the 650F and 651F storage systems are intermixed with the
normal input/output (I/O) activities that are being generated by the system application
programs. This intermixing of the different types of I/O causes the management I/O
to be delayed, which causes the Dell PowerVault manager applications to time out
while communicating with the array. If a system is experiencing I/O time-out errors
during heavy I/O activity, you can improve performance by changing the agent man-
agement I/O path to go through a dedicated logical unit number (LUN) rather than the
physical drive device driver. Change the entries in the Data Agent Configurator’s
Device window to specify the dedicated LUN by performing the following steps:
1. Click Start—> Programs—> Dell OpenManage PowerVault Manager—>
Data Managed Node—> Data Agent.
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