kernel panic when upgrading from lustre-zfs 2.3.49 -> lustre-zfs 2.4
by Nathaniel Everett Garver-Daniels
Hello,
Last year around this time I set up a lustre / zfs system based on
zfs 0.6.0_rc3_31chaos
lustre 2.3.49.92
that I built from source. It's been chugging along merrily with a
combined MGS/MDS and Three OSSs, each with one OST. For some other
reasons I had to upgrade the other machines in my cluster from Redhat
6.3 to Redhat 6.4 and it seemed like a good time to try and update to a
more official release. I followed the instructions on zfslinux.org for
adding their repository and installed zfs 0.6.2 and lustre-2.4.0.
After un-mounting all of the clients / OSTs and the MGS/MDS I restarted
the system with the new lustre and zfs installed. The zfs filesystems
looked OK, but when I tried to "mount -a -t lustre" it had a kernel
panic. I haven't been able to get a dump off of the machine yet, but I
was wondering if anyone else has run in to this type of problem when
doing an upgrade with zfs osds.
Also, any recommendations on trying to troubleshoot this while I leave
the current system running would be appreciated. My plan is to send a
zfs snapshot of the MGS/MDS to another machine and try upgrading it
there. I'm wondering if I might need to do a "zpool update" before I
try and mount the lustre filesystem.
Thanks,
-Nate Garver-Daniels
Systems Administrator