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

Lars Ellenberg lars.ellenberg at linbit.com
Thu Nov 11 21:48:19 CET 2010

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
>, 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 is obsolete.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.

> 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.

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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