[libvirt-users] Pool, iSCSI and guest start

[Dave Allan]

On 03/17/2010 06:38 AM, Nicolas Greneche wrote:
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> 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 at sandi:~# virsh pool-autostart equalog
> Pool equalog marked as autostarted
>
> root at 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