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[linux-lvm] Wierd lvm2 performance problems



Dear list,

I tried to create a PE+VG+LV ontop of a mdraid. For no obvious reason the lvm volume show extremely poor performance - The transferrates are as little as 30% of the rates on the md device itself. In contrast creating a partition table ontop of the array gives nearly no performance impact.

Does anybody have the slightest idea, wht might be going wrong here?

Regards

-Sven

P.S.: I tried aligning the first PE in the VG with the mdraid chunk size, no difference whatsoever.


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