Backend fail & 503 Service Unavailable

[Poul-Henning Kamp]

In message <113d871c0909221022g2eff01d8gf6857f0dfe27aad8 at mail.gmail.com>, M L w
rites:

>backend_conn            12054        45.32 Backend connections success
>backend_unhealthy           0         0.00 Backend connections not attempted
>backend_busy                0         0.00 Backend connections too many
>backend_fail             5900        22.18 Backend connections failures
>backend_reuse            3503        13.17 Backend connections reuses
>backend_recycle         11552        43.43 Backend connections recycles
>backend_unused              0         0.00 Backend connections unused

I don't think there is much I can suggest you, the majority of your
problem seems to be that your backend cannot keep up with the traffic
you throw at it.

Almost 1 in 3 connections to the backend fails:

	5900 / (12054 + 5900) = 0.33

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.