[CentOS-virt] VirtIO disk 'leakage' across guests?
James B. Byrne
byrnejb at harte-lyne.ca
Mon Jan 16 15:24:21 EST 2012
On Mon, January 16, 2012 13:05, James B. Byrne wrote:
> How is it even possible for an
> application running under a httpd service on one guest to
> see anything at all besides the VirtIO storage assigned to
> that guest?
>
> Has anyone else encountered this anomaly?
>
I just cloned a guest instance. The clone prototype was
set up with a single VirtIO disk of 8Gbs, divided into a
500 Mb boot and a ~7.1Gb root partition. The root
partition was entirely assigned to the basic vg and two lv
were created, one for swap and one for the actual root
partition.
When the guest was cloned there was only one VirtIO disk
of 8 Gb assigned to it and this was cloned and given a new
name.
When I look at the newly cloned guest instance with
pvdisplay this is what I see:
# 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 (but full)
PE Size 4.00 MiB
Total PE 7999
Free PE 0
Allocated PE 7999
PV UUID
umrIn6-Np0c-NC4Z-MuUo-5TBj-IKRE-XBU0De
When I look at it using vgdisplay then this is what I see:
# 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 10
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
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 9873 / 38.57 GiB
Free PE / Size 0 / 0
VG UUID
qa6jwq-5gTp-6mMH-IWl9-OrEK-HjWc-pbaFsa
What is going on and how do I fix this? The size of the
ghost pv (31Gb) is showing up as the size of the clone's
vg whereas the pv for the cloned instance is only 8Gb.
I am only using virt-manager to manage disk storage for
these guests and I have no idea why or how this mismash is
happening. Any ideas?
--
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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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