I have a Windows 7 guest running under kvm/libvirt with RBD as a backend to a cluster of 3 OSDs. With this setup, I am seeing behavior that looks suspiciously like disk corruption in the guest VM executing some of our workloads.
For instance, in one occurance, there is a python function that recursively deletes a large directory tree while the disk is otherwise loaded. For us, this occasionally fails because the OS reported that all the files in the directory were deleted, but then reports the directory is not empty when going to remove it. In another, a simple test application writes new files to a directory every 50ms, then after 6s verifies that at least 3 files were written, also while the disk is under heavy load. We have never ever seen these failures on bare metal, or on kvm instances backed by a LVM volume in years of operation, but they happen every couple of hours with RBD. Unfortunately, I have been unsuccessful when attempting to create synthetic test cases to demonstrate the inconsistent RBD behavior. Has anyone else seen similar inconsistent RBD behavior, or have ideas how to diagnose further? For reference, I am running ceph 0.41, qemu-kvm 1.0 on ubuntu 11.10 amd64. Regards, Josh -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
