19.03.2013 18:23, David Teigland wrote: > On Tue, Mar 19, 2013 at 01:32:41PM +0000, Vladislav Bogdanov wrote: >> Allow clvm locks to be converted shared <-> exclusive with corosync/dlm. >> >> Without this it is impossible to alow both >> * VM migration (shared lock is required) >> * host-side snapshots of VM disks (exlusive lock is required) >> >> Locks are only converted if --force parameter passed to lvchange. >> >> Internally LKF_CONVERT flag is passed to dlm, so that is a real lock >> conversion. >> >> Also deny release of an exclusive lock on a remote note without --force >> flag to lvchange -an. > > I'm trying to figure out why the code doesn't already use CONVERT when > possible; I would have expected it to. Like me - that's why this patch. > (It has to be combined with > NOQUEUE to avoid deadlocks.) It is from what I see. > What happens now without this force/CONVERT > patch? a new lock created/requested? > No, just returns error. ... #lvchange.c:153 Activating logical volume "lustre03-right.vds-ok.com_disk0" exclusively #activate/dev_manager.c:285 Getting device info for VG_VDS_OK_POOL_1-lustre03--right.vds--ok.com_disk0 [LVM-2nCt35tXpJcEJUErLzSM3nTjJZwr0DvX3FDOuTp381ZIEVQvUrGCqoSYs4lGhW2O] #ioctl/libdm-iface.c:1687 dm info LVM-2nCt35tXpJcEJUErLzSM3nTjJZwr0DvX3FDOuTp381ZIEVQvUrGCqoSYs4lGhW2O NF [16384] (*1) #locking/cluster_locking.c:563 Lock held for 2nCt35tXpJcEJUErLzSM3nTjJZwr0DvX3FDOuTp381ZIEVQvUrGCqoSYs4lGhW2O, node 3804050a : CR #locking/cluster_locking.c:563 Lock held for 2nCt35tXpJcEJUErLzSM3nTjJZwr0DvX3FDOuTp381ZIEVQvUrGCqoSYs4lGhW2O, node 5c04050a : CR #locking/cluster_locking.c:563 Lock held for 2nCt35tXpJcEJUErLzSM3nTjJZwr0DvX3FDOuTp381ZIEVQvUrGCqoSYs4lGhW2O, node 3904050a : CR #activate/activate.c:1050 VG_VDS_OK_POOL_1/lustre03-right.vds-ok.com_disk0 is active #locking/cluster_locking.c:503 Locking LV 2nCt35tXpJcEJUErLzSM3nTjJZwr0DvX3FDOuTp381ZIEVQvUrGCqoSYs4lGhW2O EX (LV|NONBLOCK|CLUSTER|LOCAL) (0xdd) #locking/cluster_locking.c:391 Error locking on node 3904050a: Device or resource busy ... _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
