Dell 651F, 650F manual SAN Performance Tuning, C H A P T E R 1

C H A P T E R 1 7

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

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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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