So in my case what would $name be? -- Tom > -----Original Message----- > From: Brad Hubbard [mailto:bhubbard@xxxxxxxxxx] > Sent: Monday, August 29, 2016 5:29 PM > To: Mykola Golub <mgolub@xxxxxxxxxxxx> > Cc: Deneau, Tom <tom.deneau@xxxxxxx>; ceph-devel@xxxxxxxxxxxxxxx > Subject: Re: debugging librbd to a VM > > On Mon, Aug 29, 2016 at 6:03 PM, Mykola Golub <mgolub@xxxxxxxxxxxx> wrote: > > May be qemu does not see you ceph.conf? Or some other environmental > > issue (e.g. with qemu rbd driver). Try > > > > ldd /usr/bin/qemu-system-x86_64 |grep rbd > > > > Have you tried starting it from command line? > > > > You could check if config debug options work as expected setting them > > on your working cluster. > > You can also try "touch /tmp/cbt/ceph/log/$name.log" and "chmod 777 > /tmp/cbt/ceph/log/$name.log" to eliminate permissions issues. > > > > > On Fri, Aug 26, 2016 at 09:08:30PM +0000, Deneau, Tom wrote: > >> I have two small clusters configured with the same version of Ceph and > the same OS version. > >> (different processor hardware) > >> > >> On these clusters I have bootable RBD images that I expect a VM to boot > from. > >> On one cluster, the VM does not boot from the image. On the other > cluster, it boots fine. > >> On the failing cluster, a VM can boot fine from the base qcow2 image > from which the rbd image was created. It's only rbd images that are > causing problems for the VM. > >> > >> I would like to enable some debug logging that could tell where the two > clusters are diverging. > >> > >> I tried adding > >> debug rbd = 20 > >> log file = /tmp/cbt/ceph/log/$name.log > >> > >> I do see some rbd debug messages to stderr during operations like rbd > clone, etc. but I don't see any log files created in /tmp/cbt/ceph or > /var/log/ceph or any messages when librbd is being used by say qemu-img > convert, or by qemu-kvm. > >> > >> Is there a way to see detailed debug messages for librbd? > >> > >> Or is there a better way to see where things are diverging between > these two clusters? > >> (note: I tried lttng but could not get it to record anything) > >> > >> -- Tom > >> -- > >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" > >> in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > >> info at http://vger.kernel.org/majordomo-info.html > > > > -- > > Mykola Golub > > -- > > To unsubscribe from this list: send the line "unsubscribe ceph-devel" > > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > > info at http://vger.kernel.org/majordomo-info.html > > > > -- > Cheers, > Brad ��.n��������+%������w��{.n����z��u���ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
