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I have faced a similar issue on one of my compute nodes, there was issues in gracefully detaching volumes from one of the compute nodes(from a 3 node compute and 1 controller). What you may check is if these packages are installed on each compute nodes. "sysfsutils ,sg3_utils, multipath-tools"

On redhat based systems, use "yum install sysfsutils sg3_utils multipath-tools -y " to install these . All the best!