[DRBD-user] Problems with drbd performance with Xen

Lars Ellenberg lars.ellenberg at linbit.com
Fri Feb 20 13:25:41 CET 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On Fri, Feb 20, 2009 at 12:19:56PM +0000, Igor Neves wrote:
> I think i have found the problem, and it's related to bonding.
> 
> For testing this correctly, I have setup the full disk on the HBA, and
> now I have /dev/sda that can do this:
> Reading: ~568 MB/s
> Writing: ~472 MB/s
> 
> I setup drbd0 to attach to this disk and with resource disconnected I
> get about ~260 MB/s writing (still far from the backend device).
> With drbd0 connected using bond0 for replication, I get 60MB/sec.
> 
> My question is, what is happening?

I don't know.
I'm not there.
you are.
you tell me.

 ;)

> PS: bond0 was tested with iperf, and I get 1.8Gbit transfer between
> nodes, same link drbd uses.

We have several DRBD running over bonding just fine.

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

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