Re: [libvirt-users] Pool, iSCSI and guest start

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dave Allan wrote: > On 03/17/2010 06:38 AM, Nicolas Greneche wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Hi, >> >> Former user of Xen and newbie in kvm/qemu/libvirt stuff, I give it a try >> on my network ;-) >> >> I need to run a VM with iSCSI target attached. >> >> I did it this way : >> >> 1) Creation of iscsi pool (equa.xml) : >> >> <pool type="iscsi"> >> <name>equalog</name> >> <source> >> <host name="10.10.0.1"/> >> <device >> path="iqn.2001-05.com.equallogic:0-8a0906-4992c7f05-39c000000114b8fc-vglog"/> >> >> </source> >> <target> >> <path>/dev/disk/by-path</path> >> </target> >> </pool> >> >> This pool start smoothly (when open-iscsi started), no problems. An >> entry is created in /dev/disk/by-path/ related to iscsi target. >> >> 2) I flagged it autostart : >> >> root@sandi:~# virsh pool-autostart equalog >> Pool equalog marked as autostarted >> >> root@sandi:~# virsh pool-list >> Name State Autostart >> - ----------------------------------------- >> equalog active yes >> >> 3) In my guest VM, I have following section : >> >> <disk type='block' device='disk'> >> <driver name='qemu'/> >> <source >> dev='/dev/disk/by-path/ip-10.10.0.1:3260-iscsi-iqn.2001-05.com.equallogic:0-8a0906-4992c7f05-39c000000114b8fc-vglog-lun-0'/> >> >> <target dev='vdc' bus='virtio'/> >> <alias name='virtio2'/> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' >> function='0x0'/> >> </disk> >> >> When I start VM, iscsi target is availaible. >> >> The snag is that when I reboot the host, the pool is not automatically >> started (making it impossible to autostart VM relying on this iscsi >> volume). >> >> I verified that open-iscsi is started first. Startup script is localised >> in /etc/rcS.d which is prior to /etc/rc2.d (my default runlevel). >> Libvirtd is started in rc2.d and not mentionned in rcS.d. >> >> My questions are : >> - - Is this the correct way to attach iscsi volume to a guest ? >> - - Did I missed something to have iscsi pool autostart working at boot >> time ? > > You're doing everything right, so it's odd that the pool isn't > autostarting. Does the pool autostart properly if you restart libvirtd > when the system is fully booted? > > Dave > > Hi Dave, It's a very odd problem. Making network debugging with tcpdump makes me see that my network stack doesn't receive "arp reply" related to my target. If I add an ARP entry by hand in cache or a sleep just before libvirtd start function in startup script it works like a charm. Very odd, I asked debian package maintainers for help : http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574358