Dell PowerVault MD3000i Handmatig afstemmen - Pagina 4

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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices

1 Audience and Scope

This document is intended to guide MD3000 and MD3000i customers through

the advanced processes behind tuning their storage array to best suit their

individual needs. Presented within are the best practices that must be observed

in performance tuning a first generation firmware (06.XX.XX.XX) and second

generation firmware (07.XX.XX.XX) storage array. For further detail on

determining Firmware Generation of a MD3000 or MD3000i storage array,

please view the Dell™ Users Guide at http://support.dell.com/manuals.

The challenge of storage performance tuning is to understand and control the

interacting components (listed below) while accurately measuring the application

performance. Because the performance of the storage array accounts for only a

portion of the overall application performance, tuning must be performed taking

into account the input/output (I/O) characteristics of the application and all of the

components involved in the data path, such as the SAS HBA, iSCSI initiator,

network switch and host operating system settings.

With multiple aspects to consider, the task of performance tuning to maximize

performance for even one application can seem formidable. Tuning the system to

maximize performance of multiple applications that may share a single storage

array can seem even more formidable. To reduce the complexity of tuning, Dell™

storage systems feature performance monitoring and flexible tuning controls that

can be accessed through the Modular Disk Storage Manager (MDSM).

This white paper provides an overall approach to tuning I/O performance and

also provides specific guidelines for using the storage array tuning controls.

These recommendations begin with an overall analysis of the elements that

determine I/O performance:

• Storage array

• Application software

• Server platform (hardware, operating system, volume managers,

device drivers)

• Network (for MD3000i only)

The first principles of I/O performance tuning include the following question:

What should be the performance for my system?

December 2008 – Revision A01

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