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From: "Kees Hoekzema" <kees@tweakers.net>
To: <users@httpd.apache.org>
Subject: RE: How to scale apache to deal with network outages
Date: Thu, 22 Aug 2002 03:35:40 +0200
Message-ID: <CCEOIHEKOCAIAFGIFDHIMEGLGIAA.kees@tweakers.net>
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In-Reply-To: <3D6429EE.30405@expertcity.com>

hey,

At the moment we deal with it with low timeout values, the surrent timeout
is 10 seconds.
We have around 20M requests daily, server by 8 apache servers with the
settings:
Timeout 10
MinSpareServers 30
MaxSpareServers 50
StartServers 40

Okay, those servers have all 1G on the mainboard and a loadbalancer in front
of them, but those settings should work with high loaded websites.

-kees

> -----Original Message-----
> From: Steve Francis [mailto:steve@expertcity.com]
> Sent: Thursday, August 22, 2002 2:02 AM
> To: users@httpd.apache.org
> Subject: How to scale apache to deal with network outages
>
>
> How do large scale sites deal with network outages that consume all the
> apache servers?
>
> We run apache 2.0.39 - normally there's about 50 active processes.  If a
> network glitch appears (internal ATT routing loop, BGP sesssions
> flapping on a provider, etc) then the apache servers get stuck dealing
> with the connection they are currently servicing, and wait for TCP
> retransmissions and ultimately the connection to die before releasing
> the connection and thus servicing the next client.
> During these times apache can grow rapidly to the max servers, and then
> stop servicing anyone until the interrupted connections expire.
>
> How do large sites deal with this - we can't just increase the max
> servers, else we run out of physical memory.
>
> TIA
>
>
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