[DRBD-user] Performance Issues on version 8.3.13

Sebastian Riemer sebastian.riemer at profitbricks.com
Thu Apr 25 15:43:17 CEST 2013

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

On 25.04.2013 14:04, GG-Net Mailing wrote:
> Hello,
> i'm running drbd on two Debian Wheezy x64 servers.
> I'm using protocol A for asynchronous sync, since one of the machines has a hybrid RAID10 on an adaptec 71605Q. Build of 2x 3TB Seagate Constellation CS SED and 2x Samsung 840 500GB. And the other only has a plain 1TB HDD.
> If I run a simple dd test on the node with the RAID copying from /dev/zero to a file on the device with drbd disabled, I get results around 400mb/s.
> The moment I start drbd with the node as primary and run the test again, my results are roughly 110mb/s.
> Are there any known issues regarding this?

Yes, don't expect wonders from your 1 GbE network link or the single HDD
on the secondary!
1 Gbit/s / 8 = 128 MB/s. More isn't possible with 1 GbE.

If disconnected, the data doesn't have to travel through the network to
the secondary. Simple as that.


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