I'm encountering a problem with RBD-backed Xen. During a VM boot, pygrub attaches the VM's root VDI to dom0. This hangs with these messages in the debug log: Oct 27 21:19:59 xen27 kernel: vbd vbd-51728: 16 Device in use; refusing to close Oct 27 21:19:59 xen27 xenopsd-xenlight: [xenops] waiting for backend to close Oct 27 21:19:59 xen27 kernel: qemu-system-i38[2899]: segfault at 7fac042e4000 ip 00007fac0447b129 sp 00007fffe7028630 error 4 in qemu-system-i386[7fac042ed000+309000] More details here: http://pastebin.ca/2472234 - Scientific Linux 6 - 64-bit, Phenom CPU - Ceph from RPM ceph-0.67.4-0.el6.x86_64 - XenAPI from Dave Scott's technology preview - two btrfs-backed OSDs with journals on separate drives - various kernels, incl. 3.4.6 from Dave Scott's repo and 3.11.6 from elrepo.org. This thread (whose Subject: I borrowed) describes what I'm seeing quite well, but no resolution was posted: http://comments.gmane.org/gmane.comp.file-systems.ceph.user/3636 In my case, udevd starts a 'blkid' process that holds /dev/xvdb open. Like in James's case, any interaction with the device will hang, and usually can't be killed. This same problem prevents the machine from completing shutdown. In that thread, Sylvain Munaut says the OSD and kernel driver shouldn't be run in the same host. I believe my setup does not violate that, since the rbd kernel module is not loaded, and instead the device is attached through the xen_blkfront module instead. Thanks- John _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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