Hello, How frequently do RBD device names get reused? For instance, when I map a volume on a client and it gets mapped to /dev/rbd0 and when it is unmapped, does a subsequent map reuse this name right away? I ask this question, because in our use case, we try to unmap a volume and we are thinking about adding some retries in case unmap fails for any reason. But I am concerned about race conditions such as the following: 1. thread 1 calls unmap, but the call times out and returns in the process, but in the background unmap request does go through and the device gets removed 2. thread 1 does a retry based on the device name. If between 1 and 2, another thread tries to map another volume and if it gets mapped to same device right after previous unmap was successful, then in step 2, we will be trying to unmap a device that doesn't belong to previous map. So I want to know how frequently do the device names get reused, and if there is a way to keep them using new names until they round back after a max limit. Thanks, Shridhar