[Pacemaker] DRBD < LVM < EXT4 < NFS performance

[Jake Smith]

I ran into that (scheduler change) also after upgrading. I only accidentally stumbled onto that fact. I wish Ubuntu had made it a little clearer that not having a separate server kernel had more implications than just kernel!

Jake

----- Reply message -----
From: "Christoph Bartoschek" <ponto at pontohonk.de>
To: <pacemaker at clusterlabs.org>
Subject: [Pacemaker] DRBD < LVM < EXT4 < NFS performance
Date: Sun, Jun 10, 2012 8:59 am




Hi,

we did not solve the performance issue yet. However we could improve the 
responsiveness of the system. We no longer get timeouts and reenabled 
pacemaker.

The problem that lead to an unresponsive system was that Ubuntu 12.04 LTS 
uses the cfq I/O-Scheduler by default. Ubuntu 10.04 LTS used the dedline 
scheduler.

After changing the scheduler to deadline on 12.04 the load drastically went 
down and we get not timeouts.

Christoph


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