What is fan-out ratio? - Definition from WhatIs.com
Part of the Storage hardware glossary:

A fan-out ratio is the relationship in quantity between a single port on a storage device and the number of servers that are attached to it.

It is important to know the fan-out ratio in a storage area network (SAN ) design so that each server gets optimal access to storage resources. When the fan-out ratio is high and the storage array becomes overloaded, application performance will be affected negatively. Too low a low fan-out ratio, however, results in an uneconomic use of storage.

Key factors in deciding the optimum fan-out ratio are server host bus adapter (HBA) queue depth, storage device input/output (IOPS) and port throughput.

This was last updated in March 2012
Contributor(s): Antony Adshead
Posted by: Margaret Rouse

Related Terms

Definitions

Glossaries

  • Storage hardware

    - Terms related to storage hardware, including definitions about solid state drives and words and phrases about hard disk drives, tape drives, disk arrays and tiered storage.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About fan-out ratioPowered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.