Red Hat Bugzilla – Bug 782261
Empty volume group pool on F16 breaks most storageVolLookupByPath
Last modified: 2012-03-17 19:45:24 EDT
If I have a volume group names 'vgvirt' with no logical volumes, there doesn't seem to be a directory under /dev whether the VG is marked 'available' or not. This might be different than behavior in older fedoras.
Unfortunately this can break storageVolLookupByPath for an unrelated storage volume (depends on how libvirt orders pools internally):
$ cat footest.py
if os.getuid() != 0:
print "run as sudo"
conn = libvirt.open("qemu:///system")
$ sudo python footest.py
libvir: Storage error : cannot read dir '/dev/vgvirt': No such file or directory
Traceback (most recent call last):
File "footest.py", line 11, in <module>
File "/usr/lib64/python2.7/site-packages/libvirt.py", line 2801, in storageVolLookupByPath
if ret is None:raise libvirtError('virStorageVolLookupByPath() failed', conn=self)
libvirt.libvirtError: cannot read dir '/dev/vgvirt': No such file or directory
libvirt probably needs to be resilient to an empty vg and the lack of directory under dev that comes with it.
*** Bug 714431 has been marked as a duplicate of this bug. ***
We need to backport this to F16:
Author: Cole Robinson <firstname.lastname@example.org>
Date: Wed Jan 25 12:07:14 2012 -0500
storage: Fix any VolLookupByPath if we have an empty logical pool
On F16 at least, empty volume groups don't have a directory under /dev.
The directory only appears once a logical volume is created.
This tickles some behavior in BackendStablePath which ends with
libvirt sleeping for 5 seconds while waiting for the directory to appear.
This causes all sorts of problems for the virStorageVolLookupByPath API
which virtinst uses, even if trying to resolve a path that is independent
of the logical pool.
In reality we don't even need to do that checking since logical pools
always have a stable target path. Short circuit the polling in that
libvirt-0.9.6-5.fc16 has been submitted as an update for Fedora 16.
* should fix your issue,
* was pushed to the Fedora 16 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing libvirt-0.9.6-5.fc16'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
libvirt-0.9.6-5.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.