On Tue, Mar 13, 2012 at 03:42:36PM +0100, Frido Roose wrote: > Hello, > > I configured libvirtd with the sanlock lock manager plugin: > > # rpm -qa | egrep "libvirt-0|sanlock-[01]" > libvirt-lock-sanlock-0.9.4-23.el6_2.4.x86_64 > sanlock-1.8-2.el6.x86_64 > libvirt-0.9.4-23.el6_2.4.x86_64 > > # egrep -v "^#|^$" /etc/libvirt/qemu-sanlock.conf > auto_disk_leases = 1 > disk_lease_dir = "/var/lib/libvirt/sanlock" > host_id = 4 > > # mount | grep sanlock > /dev/mapper/kvm--shared-sanlock on /var/lib/libvirt/sanlock type gfs2 > (rw,noatime,hostdata=jid=0) > > # cat /etc/sysconfig/sanlock > SANLOCKOPTS="-R 1 -o 30" > > I increased the sanlock io_timeout to 30 seconds (default = 10), because > the sanlock dir is on a GFS2 volume and can be blocked for some time while > fencing and journal recovery takes place. > With the default sanlock io timeout, I get lease timeouts because IO is > blocked: > Mar 5 15:37:14 raiti sanlock[5858]: 3318 s1 check_our_lease warning 79 > last_success 3239 > Mar 5 15:37:15 raiti sanlock[5858]: 3319 s1 check_our_lease failed 80 > > So far, all fine, but when I restart sanlock and libvirtd, it takes about 2 > * 30 seconds = 1 minute before libvirtd is usable. "virsh list" hangs > during this time. I can still live with that... > But it gets worse after a reboot, when running a "virsh list" even takes a > couple of minutes (like about 5 minutes) before it responds. After this > initial time, virsh is responding normally, so it looks like an > initialization issue to me. > > Is this a configuration issue, a bug, or expected behavior? Each libvirtd instance has a lease that it owns. When restarting libvirtd it tries to acquire this lease. I don't really understand why, but sanlock sometimes has to wait a very long time between starting & completing its lease acquisition. You'll probably have to ask the sanlock developers for an explanation of why Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|