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https://reviews.apache.org/r/20184/
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Review request for cloudstack, Mike Tutkowski, Marcus Sorensen, and Wido den
Hollander.
Bugs: CLOUDSTACK-6369
https://issues.apache.org/jira/browse/CLOUDSTACK-6369
Repository: cloudstack-git
Description
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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.
https://issues.apache.org/jira/browse/CLOUDSTACK-6369
This patch is written on the top of https://reviews.apache.org/r/19446/ . This
patch cannot be applied before 19446 is merged.
Diffs
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agent/conf/agent.properties b8b7a7c
core/src/com/cloud/storage/JavaStorageLayer.java e8c4053
plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java
61d90e9
Diff: https://reviews.apache.org/r/20184/diff/
Testing
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Case1 (without this option)
1. Ensure "storage.qcow2.cluster_size" is not written in "agent.properties"
file.
2. Create and attach a volume.
3. Confirm the created volume is provisioned with cluster_size=65536, which is
a default value.
Case2 (with this option)
1. Ensure "storage.qcow2.cluster_size=2097152" is written in "agent.properties"
file.
2. Create and attache a volume.
3. Confirm the created volume is provisioned with cluster_size=2097152.
Thanks,
Yoshikazu Nojima
