---
name: "Perlbal::Manual::FailOver"
section: "3pm"
platform: "linux"
package: "libperlbal-perl"
version: "1.80-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Perlbal::Manual::FailOver"
---

# Perlbal::Manual::FailOver(3pm)

Fail Over mechanism in Perlbal

## NAME

Perlbal::Manual::FailOver - Fail Over mechanism in Perlbal

### VERSION

Perlbal 1.78.

### DESCRIPTION

How Perlbal's Fail Over mechanism works.

### Fail Over

Whenever Perlbal fails to open a connection to a machine, it assumes that machine is not available and spreads the load between the remaining servers. It keeps trying to open connections to that server according to `"error_retry_schedule"`.

If there are no available servers, Perlbal will keep trying to open connections to the servers until `"idle_timeout"` is reached, upon which it will close the connection to the user. Clients interpret that closing differently: most will assume a 500 HTTP code, a few assume a 200 OK with empty content.

For more information on parameters `"idle_timeout"` and `"error_retry_schedule"` see Perlbal::Manual::ReverseProxy.

### SEE ALSO

Perlbal::Manual::LoadBalancer, Perlbal::Manual::ReverseProxy.