[CentOS-virt] [CentOS] VirtIO disk 'leakage' across guests?
James B. Byrne
byrnejb at harte-lyne.ca
Tue Jan 17 12:46:43 EST 2012
On Mon, January 16, 2012 17:01, Dennis Jacobfeuerborn wrote:
> On 01/16/2012 10:16 PM, James B. Byrne wrote:
>
> ...
>> The xmldump for this guest instance contains this:
> ...
>
> Please post the xmldumps of the original guest and cloned
> guest right after
> cloning and without any modifications.
>
> Regards,
> Dennis
Prototype dumpxml
virsh # dumpxml vm-centos-6
<domain type='kvm' id='34'>
<name>vm-centos-6</name>
<uuid>77692b36-d424-175f-b991-abc58fa0359b</uuid>
<description>vm clone prototype
root user password: protoype</description>
<memory>2097152</memory>
<currentMemory>2097152</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='rhel6.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source dev='/dev/vg_vhost01/lv_vm_base'/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x05' function='0x0'/>
</disk>
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<alias name='ide0-1-0'/>
<address type='drive' controller='0' bus='1' unit='0'/>
</disk>
<controller type='ide' index='0'>
<alias name='ide0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:28:7e:ce'/>
<source bridge='br0'/>
<target dev='vnet5'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/6'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/6'>
<source path='/dev/pts/6'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='5905' autoport='yes'/>
<sound model='ac97'>
<alias name='sound0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/>
</memballoon>
</devices>
<seclabel type='dynamic' model='selinux' relabel='yes'>
<label>system_u:system_r:svirt_t:s0:c299,c322</label>
<imagelabel>system_u:object_r:svirt_image_t:s0:c299,c322</imagelabel>
</seclabel>
</domain>
virsh #
A substantially identical clone of the prototype. This
guest has had no additional storage added to it.
virsh # dumpxml sshpipe.harte-lyne.ca
<domain type='kvm' id='19'>
<name>sshpipe.harte-lyne.ca</name>
<uuid>5fbd2bad-059c-da0d-c856-c16cfb831a9a</uuid>
<description>vm clone prototype
root user password: protoype</description>
<memory>2097152</memory>
<currentMemory>2097152</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='rhel6.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source
dev='/dev/vg_vhost01/lv_vm_sshipe.harte-lyne.ca_00'/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x05' function='0x0'/>
</disk>
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<alias name='ide0-1-0'/>
<address type='drive' controller='0' bus='1' unit='0'/>
</disk>
<controller type='ide' index='0'>
<alias name='ide0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:ee:d8:32'/>
<source bridge='br0'/>
<target dev='vnet2'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/3'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/3'>
<source path='/dev/pts/3'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='5902' autoport='yes'/>
<sound model='ac97'>
<alias name='sound0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/>
</memballoon>
</devices>
<seclabel type='dynamic' model='selinux' relabel='yes'>
<label>system_u:system_r:svirt_t:s0:c876,c1002</label>
<imagelabel>system_u:object_r:svirt_image_t:s0:c876,c1002</imagelabel>
</seclabel>
</domain>
virsh #
The second guest, sshpipe, shows this for pvdisplay:
[root at sshpipe ~]# pvdisplay
Couldn't find device with uuid
umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De.
--- Physical volume ---
PV Name /dev/vda2
VG Name vg_vm_centos_6
PV Size 7.32 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 1874
Free PE 0
Allocated PE 1874
PV UUID
djM23m-6Yeb-BQ2x-gPh9-ORMt-dX2i-Ou9xBQ
--- Physical volume ---
PV Name unknown device
VG Name vg_vm_centos_6
PV Size 31.25 GiB / not usable 3.97 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 7999
Free PE 1855
Allocated PE 6144
PV UUID
umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De
and this for vgdisplay
[root at sshpipe ~]# vgdisplay
Couldn't find device with uuid
umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De.
--- Volume group ---
VG Name vg_vm_centos_6
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 2
Act PV 1
VG Size 38.57 GiB
PE Size 4.00 MiB
Total PE 9873
Alloc PE / Size 8018 / 31.32 GiB
Free PE / Size 1855 / 7.25 GiB
VG UUID
qa6jwq-5gTp-6mMH-IWl9-OrEK-HjWc-pbaFsa
But, sshpipe should only have a single 8Gb VirtIO disk
assigned.
--
*** E-Mail is NOT a SECURE channel ***
James B. Byrne mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
--
*** E-Mail is NOT a SECURE channel ***
James B. Byrne mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
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