[DRBD-user] Low performance over NFS after upgrade from 0.7.25 to 8.2.7

Håkan Engblom zyber_cynic at hotmail.com
Tue Nov 16 19:17:24 CET 2010


See below
 
 

> Date: Thu, 11 Nov 2010 21:48:19 +0100
> From: lars.ellenberg at linbit.com
> To: drbd-user at lists.linbit.com
> Subject: Re: [DRBD-user] Low performance over NFS after upgrade from 0.7.25 to 8.2.7
> 
> On Thu, Nov 04, 2010 at 01:55:56PM +0100, Håkan Engblom wrote:
> > 
> > Hi drbd-users,
> > 
> > We use DRBD on a system with two fileservers. We have three replicated
> > DRBD-partitions, and on top of that we use ext3 filesystem, and these
> > are exported over NFS,
> > pretty basic setup. NFS-server is in kernel. Linux kernel is
> > 2.6.27.39, running on a x86_64 system. C-protocol for drbd.
> 
> > The problem we have is that after the upgrade to 8.2.7,
> 
> There is absolutely no reason to upgrade to 8.2, 8.2. is obsolete.
> Upgrade to 8.3.
Technically I agree, but unfortunately there are administrative reasons for taking 8.2.7 and not 8.3
8.2.7 is included in our linux distro, and the company I work at think it is then supported by our linux
supplier....
 
> 
> > the
> > performance, when creating many small files from an NFS-client, has
> > decreased drastically. 
> 
> Then read about the disk settings no-disk-barrier, no-disk-flushes,
> no-md-flushes, which did not exist in 0.7, and have performance impact.
Missed this. Manipulating these settings "solves" the issue.
> 
> 
> -- 
> : Lars Ellenberg
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com
> 
> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
> __
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