FW: [DRBD-user] slow sync speed of 12TB over 10GE

Robert Dunkley Robert at saq.co.uk
Mon Jan 19 11:39:52 CET 2009


Correction: Just noticed you are using Dual Core AMDs. Please try CPU masks of 1 and 3.

-----Original Message-----
From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Robert Dunkley
Sent: 19 January 2009 10:34
To: Lars Täuber
Cc: drbd-user at lists.linbit.com
Subject: RE: [DRBD-user] slow sync speed of 12TB over 10GE

Hi Lars,

If you have BBUs in the raid card then try adding the following to the disk section:
no-disk-flushes;no-md-flushes;

What is the MTU set to on the LAN connection? 

Also in the syncer section try "cpu-mask 1" and "cpu-mask 5". The NUMA based architecture of Opteron boards means the CPU directly connected to the Raid card bus is usually faster.

Hope this helps,

Rob

-----Original Message-----
From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Lars Täuber
Sent: 19 January 2009 10:33
To: drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] slow sync speed of 12TB over 10GE

Hi Robert,

"Robert Dunkley" <Robert at saq.co.uk> schrieb:
> Hi Lars,
> 
> What are you using to interconnect the two DRBD systems? Loss of half of performance seems excessive. I usually get about 95% of the arrays sustained write performance and multiple arrays can synch at once without penalty.

I use 10GEthernet. Have a look:
http://lists.linbit.com/pipermail/drbd-user/2009-January/011169.html

Lars
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