[one-users] Re; Snapshots ...

[Gareth Bult]

Hi,

It seems that the snapshot facility relies on the "libvirt" snapshot facility which at the moment
relies entirely upon the QEMU snapshot facility, which means you can really only snapshot QCOW
images. Before I start to modify remotes/bmm/kvm/snapshot*, is there a way or are there any plans
to move snapshot functionality to the drivers such that we can use a custom snapshot facility on
a per storage facility basis?

Case in point;

At the moment there seems to be a script which does this;

virsh --connect $LIBVIRT_URI snapshot-create-as $DOMAIN (which is QCOW2 only?)

I would like it to be able to handle this;

vdc-tool -n ON_IM_81 --mksnap "First Snapshot"
>  :: Snapshot created [First Snapshot]

vdc-tool -n ON_IM_81 --lssnap
+----------+--------------------------------------+----------+----------+----------------------+
| UniqueID | Snapshot Name                        |     Size |   Blocks | Created@             |
+----------+--------------------------------------+----------+----------+----------------------+
| 1        | First Snapshot                       |  662.53M |   370404 | 20 Oct 2013 09:55:08 |
|          | 6c0ca1c0-9d62-474a-83fc-369fa01d4068 |          |          | Root:     1196295401 |
+----------+--------------------------------------+----------+----------+----------------------+
Number of snapshot blocks used (370404) taking ( 662.53M)
Current committed blocks = 652079
Current blocks (0 ) and current size (   0.00b)

Obviously the vdc-tool output can be tweaked as necessary .. I would like to be able to integrate
this into libvirt, but the snapshot API in libvirt appears still to be on the drawing board whereas
I already have a working / usable snapshot facility ... any thoughts ?

Incidentally, I think I just spotted a bug on the Placement log;

#	Host	Action	Reason	Chg time	                Total time	Prolog time
0	node3	live-migrate	USER	19:08:46 19/11/2013	0d 00:01	0d 00:00	
1	node2	live-migrate	USER	19:09:44 19/11/2013	0d 00:03	0d 00:00	
2	node1	live-migrate	USER	19:12:56 19/11/2013	0d 00:01	0d 00:00	
3	node3	live-migrate	USER	19:13:59 19/11/2013	0d 14:47	0d 00:00	
4	node1	none	        NONE	10:00:15 20/11/2013	30d 23:55	0d 00:00	

We've accumulated 30d of total time overnight ?!
(yes, the clocks are in sync ...)

-- 
Gareth Bult 
“The odds of hitting your target go up dramatically when you aim at it.”