Browse Definitions:
Definition

zombie server (comatose server)

Contributor(s): Matthew Haughn

A zombie server is a physical server that is running but has no external communications or visibility and contributes no compute resources; essentially, it consumes electricity but serves no useful purpose.

Zombie servers are often created because user-requested applications end up getting no use or almost no use (typically defined as under six percent). Other causes include redundant or legacy applications and services that have been replaced. An estimated one in three servers in North America falls into the "undead" category.

According to a study conducted by the consulting firm Anthesis Group and Jonathan Koomey, a research fellow at Stanford University, there are approximately 3.6 million zombie servers in the United States; worldwide, the total could be as high as 10 million. Theoretically, four gigawatts of power could be saved by killing zombie servers. Based on calculations by TSO Logic, a company with 1000 servers could net savings of $300,000. AOL's five-year project to purge its sites of zombie servers netted the organization $10 million and in just one year resulted in a 35 percent reduction in its carbon footprint.

To reduce the server sprawl associated with zombie servers, multiple low-utilization servers may be combined into single virtual servers. Servers that are entirely unused can sometimes be repurposed. Otherwise, IT should just kill the zombie -- by pulling the plug.

Zombie servers are sometimes referred to as comatose servers.

See a brief video about finding and fixing zombie servers:

This was last updated in February 2016

Continue Reading About zombie server (comatose server)

Join the conversation

1 comment

Send me notifications when other members comment.

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

Please create a username to comment.

I have a few employees with the same problem. I'm thinking of unplugging them....
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

  • pure risk (absolute risk)

    Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

  • risk assessment

    Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.

SearchSecurity

  • biometrics

    Biometrics is the measurement and statistical analysis of people's unique physical and behavioral characteristics.

  • principle of least privilege (POLP)

    The principle of least privilege (POLP), an important concept in computer security, is the practice of limiting access rights for...

  • identity management (ID management)

    Identity management (ID management) is the organizational process for identifying, authenticating and authorizing individuals or ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity and disaster recovery (BCDR)

    Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • call tree

    A call tree -- sometimes referred to as a phone tree -- is a telecommunications chain for notifying specific individuals of an ...

SearchStorage

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close