There is a "bug" in libvirt 0.10.2+: /* Short-circuit if already mounted */ 385<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l385> if ((rc = virStorageBackendFileSystemIsMounted(pool)) != 0) { 386<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l386> if (rc == 1) { 387<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l387> virReportError(VIR_ERR_OPERATION_INVALID, 388<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l388> _("Target '%s' is already mounted"), 389<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l389> pool->def->target.path); 390<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l390> } 391<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l391> return -1; 392<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l392> } 393<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=d305b063ffd9dd01683e9105cfc6902948537ca4;hb=HEAD#l393>
If the NFS mount point exists on KVM host, and if the libvirt storage is missing for some reason(BUG CLOUDSTACk-2729), then the storage pool will never be created in libvirt unless you stop all the VMs, and umount the mount point. While, on libvirt 0.9.10, the code handles the situation is different: /* Short-circuit if already mounted */ 409<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=1af12e67469bb4911067ed541a04bcf2d43251e3;hb=bca060a363d3679c37ecc8bfd17f25dfa0781abb#l409> if ((ret = virStorageBackendFileSystemIsMounted(pool)) != 0) { 410<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=1af12e67469bb4911067ed541a04bcf2d43251e3;hb=bca060a363d3679c37ecc8bfd17f25dfa0781abb#l410> if (ret < 0) 411<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=1af12e67469bb4911067ed541a04bcf2d43251e3;hb=bca060a363d3679c37ecc8bfd17f25dfa0781abb#l411> return -1; 412<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=1af12e67469bb4911067ed541a04bcf2d43251e3;hb=bca060a363d3679c37ecc8bfd17f25dfa0781abb#l412> else 413<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=1af12e67469bb4911067ed541a04bcf2d43251e3;hb=bca060a363d3679c37ecc8bfd17f25dfa0781abb#l413> return 0; 414<http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/storage/storage_backend_fs.c;h=1af12e67469bb4911067ed541a04bcf2d43251e3;hb=bca060a363d3679c37ecc8bfd17f25dfa0781abb#l414> } So please stay on libvirt 0.9.10, or ask Redhat to fix the issue.
