[libvirt-users] Pool, iSCSI and guest start

[Nicolas Greneche]

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Dave Allan wrote:
> 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
> 
> 

Yes it works with a libvirtd reboot on a fully booted system. I
submitted a bug to the maintainer of the libvirt-bin Debian package.

It's very odd because libvirtd starts very late in booting process.

root at sandi:~# ls /etc/rc2.d --format=single-column
README
S01qemu-kvm
S14portmap
S15nfs-common
S17rsyslog
S17sudo
S18acpid
S18atd
S18cron
S18dbus
S18exim4
S18postfix
S18ssh
S20bootlogs
S20libvirt-bin
S21rc.local
S21rmnologin
S21stop-bootlogd

Nicolas
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