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From "Wido den Hollander (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-1301) VM I/O Throttling
Date Mon, 18 Feb 2013 17:21:13 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-1301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580720#comment-13580720
] 

Wido den Hollander commented on CLOUDSTACK-1301:
------------------------------------------------

Forgot this one: http://libvirt.org/formatdomain.html#iotune

So there is blkiotune and iotune, where we probably want iotune:

"Currently, the only tuning available is Block I/O throttling for qemu." 

So that is handled in user-space which is better then kernel space where cgroups live. cgroups
also only work with regular block devices and files, while iotune also works with RBD and
such.
                
> VM I/O Throttling
> -----------------
>
>                 Key: CLOUDSTACK-1301
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-1301
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.0.0
>            Reporter: Wei Zhou
>
> VM I/O Throttling, to set the maximum disk I/O rate of VMs.
> Virtual machines are running on the same storage device (local storage or share strage).
Because of the rate limitation of device (such as iops), if one VM has large disk operation,
it may affect the disk performance of other VMs running on the same storage device.
>  It is neccesary to set the maximum rate and limit the disk I/O of VMs.
> More details:
> https://cwiki.apache.org/confluence/display/CLOUDSTACK/VM+IO+Throttling

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