Yoshikazu Nojima created CLOUDSTACK-6369:
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Summary: Qcow2's cluster_size option support
Key: CLOUDSTACK-6369
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6369
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" command.
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 as a differential image.
This "cluster_size" option improves IOPS of a differential qcow2 image which is
created with preallocation=off.
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