[DRBD-user] network throughput

Thanos Chatziathanassiou tchatzi at arx.gr
Wed Jun 2 13:14:38 CEST 2004

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

You must be hitting the upper limit of your RAID sets.
I have three identical drbd devices on top of RAID1 each with 2x10.000 
rpm drives and I'm getting 90mB/sec during full sync - about 30 
megabytes per second per device.
hosts are connected via Intel PCI-X gigabit ethernet link (which of 
course could also be saturated around that speed).
Even when the smaller devices have finished, speed only momentarily 
jumps to 50 megabytes per second.

Sounds quite like the speed you'll get from such a setup. Just make sure 
that drbd is correctly configured on both nodes (protocol C etc)

Thanos Chatziathanassiou

Gregory Golin wrote:

>hi guys
>what kind of a network throughput should i expect from the following
>scsi drives in raid-1 on both nodes
>dedicated gig-e nics connected via 50cm long crossover cat5e cable
>it looks really low now, like 30-50 mb/s...
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