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From "Wei Zhou (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-1301) VM Disk I/O Throttling
Date Thu, 25 Apr 2013 11:36:17 GMT


Wei Zhou commented on CLOUDSTACK-1301:

I have finished the development and testing on cloudstack 4.0.2, and support KVM agent now.
for file and block, it works well.
for network devices such as Ceph, I have no idea.
It should work because the disk I/O limitation is implemented in qemu.

Three ways to limit the disk I/O:
(1) service_offering
(2) disk_offering
(3) bytes_rate/io_rate in global configuration.

I need more discussions about
(1) name of class, columns in db, names in global configuration.
(2) Is it neccesary to limit systemvm ( I think no)?
(3) For attached additional disk, is it limited by service_offering or disk_offering?

> VM Disk I/O Throttling
> ----------------------
>                 Key: CLOUDSTACK-1301
>                 URL:
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.0.0, 4.1.0
>            Reporter: Wei Zhou
>            Assignee: Wei Zhou
>             Fix For: 4.2.0
> VM Disk 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:

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