** Impact ** If user faces locking related problem when two nova-compute hosts sharing same disk area via nfs, try to download same image into cache concurrently - Then base_dir_name can be set to "_base_$my_ip" in nova.conf
Default value for base_dir_name is "_base" thus retaining existing behavior. ** Development Fix ** This issue has been address in the development trunk: https://review.openstack.org/6262 and fixed in quantal. ** Stable Fix ** This issue has been address in the stable tree: https://review.openstack.org/7269 ** Test Case ** 1. There are two nova-compute Hosts : HostA and HostB 2. NFS server : HostC exports "/shared_instances_path" 3. Both HostA and HostB mount HostC:/shared_instances_path at /shared_instances_path 4. Both HostA and HostB have "instances_path=/shared_instances_path" in their nova.conf 5. HostC:/shared_instances_path is empty to begin with 6. Two VMs are launched from the same image at the same time (Parallel VM creation) 7. Since there are no cached images in <instances_path>/_base folder - both nova-compute hosts try to download kernel and ramdisk images to the same location, same filename. This seems like problem related to file locking. Since these are two different compute hosts, @utils.synchronized is not useful. Expected Response: Parallel VM Creation as explained above should not fail. Actual Response: using same disk area from multiple nova-compute crashes instance images. ** Regression ** Minimal this is geared to small systems like ARM machines. ** Summary changed: - Parallel VM creation fails when nova-computes share the disks and each nova-compute node has no cached images. + [SRU] Parallel VM creation fails when nova-computes share the disks and each nova-compute node has no cached images. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to nova in Ubuntu. https://bugs.launchpad.net/bugs/973194 Title: [SRU] Parallel VM creation fails when nova-computes share the disks and each nova-compute node has no cached images. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/973194/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
