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RE: Antw: Re: accesslog purge starves kerberos kdc authentications

To: "'Ulrich Windl'" <Ulrich.Windl@rz.uni-regensburg.de>, <michael@stroeder.com>
Subject: RE: Antw: Re: accesslog purge starves kerberos kdc authentications
From: "Paul B. Henson" <henson@acm.org>
Date: Thu, 05 Nov 2015 12:35:59 -0800
Cc: openldap-technical@openldap.org
Content-language: en-us
In-reply-to: <563B1291020000A10001EAF1@gwsmtp1.uni-regensburg.de>
References: <20151104031401.GH3408@bender.unx.cpp.edu> <5639A9D7.4020806@stroeder.com> <20151105022754.GI3408@bender.unx.cpp.edu> <563B1291020000A10001EAF1@gwsmtp1.uni-regensburg.de>
Thread-index: AQJyFVk5Ip/haNHWa58gsIz+2/VI5QHO2wFGAZuWuaECioZnJp0cP+fQ

> From: Ulrich Windl
> Sent: Wednesday, November 04, 2015 11:26 PM
> 
> Maybe you have an I/O bottleneck? Could you try (for a test) to put the
> accesslog into a RAM disk? What filesystem are you using? Special mount
> options?

Yes, I'm pretty sure it is an I/O issue. The problem only occurs on the physical servers, the virtual machines (which are on a SAN with much better performance than local disks) don't exhibit this issue. While it is thrashing iotop shows the write load at about 2MB/s. It's on a linux system using ext4, the only special mount option is relatime.

References:
- accesslog purge starves kerberos kdc authentications
  - From: "Paul B. Henson" <henson@acm.org>
- Re: accesslog purge starves kerberos kdc authentications
  - From: Michael Ströder <michael@stroeder.com>
- Re: accesslog purge starves kerberos kdc authentications
  - From: "Paul B. Henson" <henson@acm.org>
- Antw: Re: accesslog purge starves kerberos kdc authentications
  - From: "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>

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