Hi all, I'm using ceph as storage backend for Nova and Glance, and merged the rbd-ephemeral-clone patch into Nova. As VM disks are Copy-on-write clones of a image, I have some concerns about this:
1. Since hundreds of vm disks based on one base file, is there any performance problems that IOs are loaded on this one paticular base file? 2. Is it possible that the data of base file is damaged or PG/OSD containing data of this base file out of service, resulting as all the VMs based on that base file malfunctioned? If so, flattening Copy-on-write clones may do some help. Is it necessary to do it?
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