KVM guest disk performance

Posted by Alex on Ask Ubuntu See other posts from Ask Ubuntu or by Alex
Published on 2012-09-06T19:26:33Z Indexed on 2012/10/01 15:53 UTC
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virtualization

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kvm

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vm

My KVM guest does max. 200MB/s although the host does easily > 700MB/s (Raid 0 with 4 SSDs).

Configuration: File-based storage (raw), cache none.

Host 24 cores, 96GB ram, Ubuntu 12.04.1 LTS and virt-manager.

I suspect the CPU to be the bottleneck (one core goes up during hdparm).

Anyone experienced the same or has an explanation ?

Edit: one more info: guest is the same as host (Ubuntu 12). Same poor disk performance observed with Windows 2008 R2 and Suse Enterprise Linux (9 or 10 I think). Max 1 guest running.

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