SAN fine tuning: Get the most from your storage


SAN fine tuning: Get the most from your storage

This piece was adapted from an article in the April 2006 issue of "Storage" magazine.

What you will learn from this tip: The way key storage

Continue Reading This Article

Enjoy this article as well as all of our content, including E-Guides, news, tips and more.

By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.

You also agree that your personal information may be transferred and processed in the United States, and that you have read and agree to the Terms of Use and the Privacy Policy.

Safe Harbor

area network (SAN) components, principally host bus adapters (HBAs) and switches, are configured will determine overall SAN performance. If you know what to look for and how to make adjustments, performance issues can be greatly reduced.

SANs are among the most mission-critical enterprise networks, so organizations tend to overbuy and over-allocate SAN capacity to avert performance problems. Buying more capacity might work sometimes, but it isn't always an option. Storage administrators need to find ways to wring more value out of their SANs, and performance tuning is the place to start.

All SAN hardware vendors offer tools that configure, monitor and collect performance data for their devices. For example, Emulex Corp.'s HBAnyware allows administrators to discover HBAs and collect data about their status, attributes and performance. Brocade Communications Systems Inc.'s optional Advanced Performance Monitoring tool collects SilkWorm director performance data, which can be viewed in its Fabric Manager or exported to Microsoft Excel. EMC Corp.'s Navisphere Analyzer, an add-on to its Navisphere Management Suite, allows Clariion users to gather performance data and identify trends. Yet the key to SAN performance tuning is knowing what device settings to monitor -- for HBAs, Fibre Channel (FC) directors, arrays or tape libraries -- and when their parameters need adjusting.

Use this checklist as a guide for performance tuning:


  • Leave the FC ports at autonegotiate
  • Avoid putting more HBAs on a server than the bus throughput can support
  • Turn on the I/O coalesce parameter in high-performance environments
  • Install the latest HBA firmware and driver
  • Use multipathing software that supports both load balancing and path failover

FC switches

  • Keep the highest performing directors at the core of the SAN
  • Connect storage devices and the highest performing applications to the core
  • Benchmark the performance on oversubscribed ports
  • Leave the FC ports at autonegotiate for host and storage connections

Of course, SAN tuning is a work in progress. You need to constantly monitor and tinker with your storage fabric on a regular basis to get the best performance. By taking simple steps to tune SAN components before they're installed in the SAN, and knowing which ones to analyze first when performance hiccups occur, the number of performance issues will be greatly reduced down the road.

Do you know…

How to alleviate congestion on ISCSI SANs?

How to use a director switch?

Jerome M. Wendt is a storage analyst specializing in open-systems storage and SANs. Systems engineer Mike Skomal also contributed to this article.

This was first published in June 2006

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.