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From Andrei Mikhailovsky <and...@arhont.com>
Subject ACS 4.2.0 + KVM + IO tunning
Date Wed, 06 Nov 2013 17:50:34 GMT
Hello guys, 

I was wondering if anyone has successfully managed to set IO limits in ACS 4.2.0. I've done
some testing and I can't make it work. 

I've created two disk offerings, one with 20MB/s limit and another with 50MB/s. I've added
both to a vm and dome simple dd tests. The limits are not working and I can successfully read
and write faster than 200+MB/s. 

I've checked the kvm vm xml definition file and I can see the iotune parameters like these:


Disk 1 with 20MB/s limit : 
<iotune> 
<read_bytes_sec>20480000</read_bytes_sec> 
<write_bytes_sec>20480000</write_bytes_sec> 
<read_iops_sec>500</read_iops_sec> 
<write_iops_sec>500</write_iops_sec> 
</iotune> 

Disk 2 with 50MB/s limit: 

<iotune> 
<read_bytes_sec>51200000</read_bytes_sec> 
<write_bytes_sec>51200000</write_bytes_sec> 
<read_iops_sec>1000</read_iops_sec> 
<write_iops_sec>1000</write_iops_sec> 
</iotune> 



I am using Ubuntu 12.04 servers with ACS 4.2.0 + KVM (libvirt 1.0.2 and qemu 1.5.0) + RBD
primary storage. 

Could you please point me in the right direction how to setup the IO limits? 

thanks 

Andrei 

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