FW: [DRBD-user] slow sync speed of 12TB over 10GE
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.
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
If you have BBUs in the raid card then try adding the following to the disk section:
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,
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
"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:
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