Re: [Xen-devel] How to Allocate Disk Bandwidth among VMs?

[Tom Creck <tom-xen@xxxxxxxxxxx>]

The example at
"http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband/man/examples"; uses
host partition-backed VBD for domainUs.

However, I use file-backed VBD for domainU. Does dm-ioband work for
file-backed VBD? Is there any example how to configure for this case?


Ryo Tsuruta wrote:
> 
> Hi Tom,
> 
> # I'm sorry, I sent an empty e-mail a while ago.
> 
>>       I want to do disk I/O rate control over VMs. Therefore, I want to
>> allocate different disk I/O bandwidth for different Xen VMs on my host
>> machine. All domainUs use file-backed VBDs stored in domain0's file
>> system.
>>       Do you have any idea to do that? Hopefully it can be done by
>> modifying
>> Xend in domain0.
> 
> You can use dm-ioband for this purpose. dm-ioband is an I/O bandwidth
> controller implemented as a device-mapper driver and can control
> bandwidth on per partition, per user, per process basis.
> 
> In this case, install dm-ioband to the host OS, create a
> dm-ioband device on the disk which stores domainU's VBD files,
> and then assign bandwidth(determined proportional to the weight of
> each disk) to each virtual machine.
> 
> There is an example configuration available at:
> "Example #5: Bandwidth control for Xen blktap devices"
> http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband/man/examples
> 
> Please see the following URL for more information, kernel patch files
> and binary packages for RHEL5 and CentOS5 are availble.
> http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband
> 
> Please feel free to ask me if you have any questions.
> 
> Thanks,
> Ryo Tsuruta
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
> 
> 

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