Definition

hot spare

A hot spare, also called a hot standby, is a backup component that can be placed into service immediately when a primary component fails.  

The adjective "hot" means that the backup component (which can be hardware or software) can replace the primary component without shutting the system down. A hot spare can be compared to a cold spare, which requires some kind of action before it can be placed into service.  Placing a cold spare into service can increase the mean time to recovery.

In storage, hot spares are used to replace failing or failed disks in a RAID configuration. Originally, a hot spare had to be included in the array being protected, but through advances in controller design and SAN architecture, several arrays on the same SAN can now share hot spares. 

See also: hot swap, hot backup

Contributor(s): Kimberly Hefner
This was last updated in June 2013
Posted by: Margaret Rouse

Email Alerts

Register now to receive SearchStorage.com-related news, tips and more, delivered to your inbox.
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

More News and Tutorials

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: