[pve-devel] savevm tests

Alexandre DERUMIER aderumier at odiso.com
Wed Aug 29 15:36:28 CEST 2012


small update:

rbd:
it seem that vmstate is not saved in the snapshot. (I also dind't notice any vm hang during snapshot)

starting kvm with -loadvm snapshotname give

kvm: Error -22 while loading VM state

So this is why it was hanging with using loadvm monitor command.


----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: pve-devel at pve.proxmox.com 
Envoyé: Mercredi 29 Août 2012 14:34:30 
Objet: [pve-devel] savevm tests 

Hi have done some savevm tests: 

lvm + qcow2 
----------- 
It doesn't work :( 
savevm can take the snapshot, but when trying to rollback, it doesn't work. 
also you can have a lvm disk of 10GB, format with qcow2 with 5GB, the guest see 10GB. 

qcow2 
---- 
savevm works fine 
loadvm works fine,rollback in live. 
qemu-img snapshot rollback offline works 

rbd 
--- 
savevm works 
loadvm works (rollback in done), but vm hang, and we need to restart it . 
rbd rollback offline works 

sheepdog 
-------- 
savevm : hang,snapshot not take 
loadvm: don't have try 
sheedog rollback command is not already implement (soon, see sheepdog mailing) 



savevm works with mutiples disk, and can mix differents storage, they just need to support savevm command. 
If you have a qcow2 + raw, it thrown an error and don't make the snapshot. 

note :I don't know how it's works in you don't have the snapshot on all the disks. 
exemple : add a disk, take a snap1, add a second disk, take a snap2, now rollback to snap1 ? 



I have also try with the patch to disable memory saving, I didn't have had any problems. 
Maybe it could be usefull to add an option to not save memory ? 
Also maybe can we add support for qemu guest agent, to freeze filesystem in this case. 

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Alexandre D e rumier 

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