[DRBD-user] [Solved] Low drbd performance, ~50% of raw disk

bd at bc-bd.org bd at bc-bd.org
Fri Mar 1 13:10:30 CET 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 Tue, Jan 29, 2013 at 12:59:05PM +0100, bd at bc-bd.org wrote:
> Hello,
> I am trying to setup a 2 node, drbd, kvm cluster to host a couple virtual
> machines.  However the IO performance I get is quite low, both inside the guest
> and on the host when directly writing to the drbd device, compared to what I
> get on the disk directly.

As sugested we bought a BBU and enabled WriteBack on the Controller. I am now
able to max out at ~450 MB/s when writing and using 3 VMs :)

BOFH excuse #167:

excessive collisions & not enough packet ambulances

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