[DRBD-user] Slow Reads on VM - Xenserver and DRBD

Felix Frank ff at mpexnet.de
Thu Jul 26 09:43:40 CEST 2012

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

On 07/24/2012 11:46 AM, Phil Stricker wrote:
> - Slow performance in a VM
> The issue seams to be related to different OSs: In a Debian-VM, I am getting nearly full speed of the drbd-block-device , in a CentOS 5.8 VM, I can only see 10% of that speed.

If you're using stock kernels in your VMs, try
- swapping them
- hand-configuring them
- building your own, new-ish and newest versions etc.

I've seen performance issues related to defaults configured into
kernels, even on physical machines. Maybe you have that kind of culprit.

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