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From "Nux (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-6369) Qcow2's cluster_size option support
Date Mon, 21 Apr 2014 22:05:17 GMT


Nux commented on CLOUDSTACK-6369:


In case of ROOT volumes, can you confirm the cluster_size is inherited from the backing qcow2?
If yes, then this will be important when we create templates.

> Qcow2's cluster_size option support
> -----------------------------------
>                 Key: CLOUDSTACK-6369
>                 URL:
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM
>            Reporter: Yoshikazu Nojima
>            Assignee: Yoshikazu Nojima
>            Priority: Minor
>             Fix For: Future
> To improve the qcow2 performance, it is important to tune parameters of "qemu-img create"
> preallocation=metadata option, which I am working on in CLOUDSTACK-6191 improves randam
IOPS well, but the qcow2 image created with preallocation=metadata option cannot be used for
a differential image. 
> This "cluster_size" option improves IOPS of a differential qcow2 image which is created
with preallocation=off.

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