3:40 p.m.
Hi all,
For 3.6, we will not support live vm snapshot, but this is a must for the next
release.
It is trivial to create a disk snapshot in ceph (using cinder apis). The snapshot
is transparent to libvirt, qmeu and the guest os.
However, we want to create a consistent snapshot, so you can revert to the disk
snapshot and get a consistent file system state.
We also want to create a complete vm snapshot, including all disks and vm memory.
Libvirt and qemu provides that when given a new disk for the active layer, but
when using ceph disk, we don't change the active layer - we continue to use the
same disk.
Since 1.2.5, libvirt provides virDomainFSFreeze and virDomainFSThaw:
https://libvirt.org/hvsupport.html
So here is possible flows (ignoring engine side stuff like locking vms and disks)
Disk snapshot
-------------
1. Engine invoke VM.freezeFileSystems
2. Vdsm invokes libvirt.virDomainFSFreeze
3. Engine creates snapshot via cinder
4. Engine invokes VM.thawFileSystems
5. Vdsm invokes livbirt.virDomainFSThaw
Vm snapshot
-----------
1. Engine invoke VM.freezeFileSystems
2. Vdsm invokes libvirt.virDomainFSFreeze
3. Engine creates snapshot via cinder
4. Engine invokes VM.snapshot
5. Vdsm creates snapshot, skipping ceph disks
6. Engine invokes VM.thawFileSystems
7. Vdsm invokes livbirt.virDomainFSThaw
API changes
-----------
New verbs:
- VM.freezeFileSystems - basically invokes virDomainFSFreeze
- VM.thawFileSystems - basically invokes virDomainFSThaw
What do you think?
Nir
2:05 a.m.
------=_Part_6066215_1113778467.1434870341750
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
----- Original Message -----
From: "Nir Soffer" <nsoffer(a)redhat.com>
To: "devel" <devel(a)ovirt.org>
Cc: "Eric Blake" <eblake(a)redhat.com>, "Daniel Erez"
<derez(a)redhat.com>, "Francesco Romani" <fromani(a)redhat.com>,
"Adam Litke" <alitke(a)redhat.com>, "Federico Simoncelli"
<fsimonce(a)redhat.com>, "Yaniv Dary" <ydary(a)redhat.com>
Sent: Friday, June 19, 2015 11:40:23 PM
Subject: [VDSM] Live snapshot with ceph disks
Hi all,
For 3.6, we will not support live vm snapshot, but this is a must for the
next
release.
It is trivial to create a disk snapshot in ceph (using cinder apis). The
snapshot
is transparent to libvirt, qmeu and the guest os.
However, we want to create a consistent snapshot, so you can revert to the
disk
snapshot and get a consistent file system state.
We also want to create a complete vm snapshot, including all disks and vm
memory.
Libvirt and qemu provides that when given a new disk for the active layer,
but
when using ceph disk, we don't change the active layer - we continue to use
the
same disk.
Since 1.2.5, libvirt provides virDomainFSFreeze and virDomainFSThaw:
https://libvirt.org/hvsupport.html
So here is possible flows (ignoring engine side stuff like locking vms and
disks)
Disk snapshot
-------------
1. Engine invoke VM.freezeFileSystems
2. Vdsm invokes libvirt.virDomainFSFreeze
3. Engine creates snapshot via cinder
4. Engine invokes VM.thawFileSystems
5. Vdsm invokes livbirt.virDomainFSThaw
Vm snapshot
-----------
1. Engine invoke VM.freezeFileSystems
2. Vdsm invokes libvirt.virDomainFSFreeze
3. Engine creates snapshot via cinder
4. Engine invokes VM.snapshot
5. Vdsm creates snapshot, skipping ceph disks
6. Engine invokes VM.thawFileSystems
7. Vdsm invokes livbirt.virDomainFSThaw
API changes
-----------
New verbs:
- VM.freezeFileSystems - basically invokes virDomainFSFreeze
- VM.thawFileSystems - basically invokes virDomainFSThaw
What do you think?
OpenStack uses two different approaches for live snapshot:
1. When taking a snapshot of an instance, a new image (of the entire
instance) is created on Glance in qcow2 format - orchestrated by
Nova and libvirt (Snapshot xml).
2. When taking a snapshot of a single volume while the VM is running
(i.e. the volume is attached to an instance), the snapshot is taken
using Cinder with the relevant driver. The following message is displayed
in Horizon: "This volume is currently attached to an instance.
In some cases, creating a snapshot from an attached volume can result
in a corrupted snapshot." (see attached screenshot)
Since the current integration is directly with Cinder and VM snapshot
is handled by oVirt engine, we should go with a variant of option 2...
If it's too late to integrate the new verbs into 3.6, maybe we could just
settle with a similar warning when creating a live snapshot? Or block
the feature for now to avoid possible data inconsistency?
Nir
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------=_Part_6066215_1113778467.1434870341750--
10:07 a.m.
----- Original Message -----
From: "Daniel Erez" <derez(a)redhat.com>
To: "Nir Soffer" <nsoffer(a)redhat.com>
Cc: "devel" <devel(a)ovirt.org>, "Eric Blake"
<eblake(a)redhat.com>, "Francesco Romani" <fromani(a)redhat.com>,
"Adam
Litke" <alitke(a)redhat.com>, "Federico Simoncelli"
<fsimonce(a)redhat.com>, "Yaniv Dary" <ydary(a)redhat.com>
Sent: Sunday, June 21, 2015 10:05:41 AM
Subject: Re: [VDSM] Live snapshot with ceph disks
----- Original Message -----
> From: "Nir Soffer" <nsoffer(a)redhat.com>
> To: "devel" <devel(a)ovirt.org>
> Cc: "Eric Blake" <eblake(a)redhat.com>, "Daniel Erez"
<derez(a)redhat.com>,
> "Francesco Romani" <fromani(a)redhat.com>,
> "Adam Litke" <alitke(a)redhat.com>, "Federico Simoncelli"
> <fsimonce(a)redhat.com>, "Yaniv Dary" <ydary(a)redhat.com>
> Sent: Friday, June 19, 2015 11:40:23 PM
> Subject: [VDSM] Live snapshot with ceph disks
>
> Hi all,
>
> For 3.6, we will not support live vm snapshot, but this is a must for the
> next
> release.
>
> It is trivial to create a disk snapshot in ceph (using cinder apis). The
> snapshot
> is transparent to libvirt, qmeu and the guest os.
>
> However, we want to create a consistent snapshot, so you can revert to the
> disk
> snapshot and get a consistent file system state.
>
> We also want to create a complete vm snapshot, including all disks and vm
> memory.
> Libvirt and qemu provides that when given a new disk for the active layer,
> but
> when using ceph disk, we don't change the active layer - we continue to use
> the
> same disk.
>
> Since 1.2.5, libvirt provides virDomainFSFreeze and virDomainFSThaw:
> https://libvirt.org/hvsupport.html
>
> So here is possible flows (ignoring engine side stuff like locking vms and
> disks)
>
> Disk snapshot
> -------------
>
> 1. Engine invoke VM.freezeFileSystems
> 2. Vdsm invokes libvirt.virDomainFSFreeze
> 3. Engine creates snapshot via cinder
> 4. Engine invokes VM.thawFileSystems
> 5. Vdsm invokes livbirt.virDomainFSThaw
>
> Vm snapshot
> -----------
>
> 1. Engine invoke VM.freezeFileSystems
> 2. Vdsm invokes libvirt.virDomainFSFreeze
> 3. Engine creates snapshot via cinder
> 4. Engine invokes VM.snapshot
> 5. Vdsm creates snapshot, skipping ceph disks
> 6. Engine invokes VM.thawFileSystems
> 7. Vdsm invokes livbirt.virDomainFSThaw
>
> API changes
> -----------
>
> New verbs:
> - VM.freezeFileSystems - basically invokes virDomainFSFreeze
> - VM.thawFileSystems - basically invokes virDomainFSThaw
>
>
> What do you think?
OpenStack uses two different approaches for live snapshot:
1. When taking a snapshot of an instance, a new image (of the entire
instance) is created on Glance in qcow2 format - orchestrated by
Nova and libvirt (Snapshot xml).
This does not sound like compatible solution like snaphost using vdsm images.
2. When taking a snapshot of a single volume while the VM is running
(i.e. the volume is attached to an instance), the snapshot is taken
using Cinder with the relevant driver. The following message is displayed
in Horizon: "This volume is currently attached to an instance.
In some cases, creating a snapshot from an attached volume can result
in a corrupted snapshot." (see attached screenshot)
Since the current integration is directly with Cinder and VM snapshot
is handled by oVirt engine, we should go with a variant of option 2...
We support consistent snapshots with vdsm images, and should support
consistent snapshots with ceph as well.
If it's too late to integrate the new verbs into 3.6, maybe we
could just
settle with a similar warning when creating a live snapshot? Or block
the feature for now to avoid possible data inconsistency?
I think we plan live snapshot for next release, not 3.6, so we can add any
api we need.
I think our goal should be similar live snapshot as we have with other
storage types. Do we agree on this goal?
Nir
11:40 a.m.
On 06/21/2015 11:07 AM, Nir Soffer wrote:
----- Original Message -----
> From: "Daniel Erez" <derez(a)redhat.com>
> To: "Nir Soffer" <nsoffer(a)redhat.com>
> Cc: "devel" <devel(a)ovirt.org>, "Eric Blake"
<eblake(a)redhat.com>, "Francesco Romani" <fromani(a)redhat.com>,
"Adam
> Litke" <alitke(a)redhat.com>, "Federico Simoncelli"
<fsimonce(a)redhat.com>, "Yaniv Dary" <ydary(a)redhat.com>
> Sent: Sunday, June 21, 2015 10:05:41 AM
> Subject: Re: [VDSM] Live snapshot with ceph disks
>
>
>
> ----- Original Message -----
>> From: "Nir Soffer" <nsoffer(a)redhat.com>
>> To: "devel" <devel(a)ovirt.org>
>> Cc: "Eric Blake" <eblake(a)redhat.com>, "Daniel Erez"
<derez(a)redhat.com>,
>> "Francesco Romani" <fromani(a)redhat.com>,
>> "Adam Litke" <alitke(a)redhat.com>, "Federico
Simoncelli"
>> <fsimonce(a)redhat.com>, "Yaniv Dary" <ydary(a)redhat.com>
>> Sent: Friday, June 19, 2015 11:40:23 PM
>> Subject: [VDSM] Live snapshot with ceph disks
>>
>> Hi all,
>>
>> For 3.6, we will not support live vm snapshot, but this is a must for the
>> next
>> release.
>>
>> It is trivial to create a disk snapshot in ceph (using cinder apis). The
>> snapshot
>> is transparent to libvirt, qmeu and the guest os.
>>
>> However, we want to create a consistent snapshot, so you can revert to the
>> disk
>> snapshot and get a consistent file system state.
>>
>> We also want to create a complete vm snapshot, including all disks and vm
>> memory.
>> Libvirt and qemu provides that when given a new disk for the active layer,
>> but
>> when using ceph disk, we don't change the active layer - we continue to use
>> the
>> same disk.
>>
>> Since 1.2.5, libvirt provides virDomainFSFreeze and virDomainFSThaw:
>> https://libvirt.org/hvsupport.html
>>
>> So here is possible flows (ignoring engine side stuff like locking vms and
>> disks)
>>
>> Disk snapshot
>> -------------
>>
>> 1. Engine invoke VM.freezeFileSystems
>> 2. Vdsm invokes libvirt.virDomainFSFreeze
>> 3. Engine creates snapshot via cinder
>> 4. Engine invokes VM.thawFileSystems
>> 5. Vdsm invokes livbirt.virDomainFSThaw
>>
>> Vm snapshot
>> -----------
>>
>> 1. Engine invoke VM.freezeFileSystems
>> 2. Vdsm invokes libvirt.virDomainFSFreeze
>> 3. Engine creates snapshot via cinder
>> 4. Engine invokes VM.snapshot
>> 5. Vdsm creates snapshot, skipping ceph disks
>> 6. Engine invokes VM.thawFileSystems
>> 7. Vdsm invokes livbirt.virDomainFSThaw
>>
>> API changes
>> -----------
>>
>> New verbs:
>> - VM.freezeFileSystems - basically invokes virDomainFSFreeze
>> - VM.thawFileSystems - basically invokes virDomainFSThaw
>>
>>
>> What do you think?
> OpenStack uses two different approaches for live snapshot:
> 1. When taking a snapshot of an instance, a new image (of the entire
> instance) is created on Glance in qcow2 format - orchestrated by
> Nova and libvirt (Snapshot xml).
This does not sound like compatible solution like snaphost using vdsm images.
> 2. When taking a snapshot of a single volume while the VM is running
> (i.e. the volume is attached to an instance), the snapshot is taken
> using Cinder with the relevant driver. The following message is displayed
> in Horizon: "This volume is currently attached to an instance.
> In some cases, creating a snapshot from an attached volume can result
> in a corrupted snapshot." (see attached screenshot)
>
> Since the current integration is directly with Cinder and VM snapshot
> is handled by oVirt engine, we should go with a variant of option 2...
We support consistent snapshots with vdsm images, and should support
consistent snapshots with ceph as well.
> If it's too late to integrate the new verbs into 3.6, maybe we could just
> settle with a similar warning when creating a live snapshot? Or block
> the feature for now to avoid possible data inconsistency?
I think we plan live snapshot for next release, not 3.6, so we can add any
api we need.
I think our goal should be similar live snapshot as we have with other
storage types. Do we agree on this goal?
Ack on that, we should remember we can have a VM with both Cinder and
engine managed disks.
Nir
--
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
7:44 a.m.
On 19 Jun 2015, at 22:40, Nir Soffer wrote:
Hi all,
For 3.6, we will not support live vm snapshot, but this is a must for the next
release.
It is trivial to create a disk snapshot in ceph (using cinder apis). The snapshot
is transparent to libvirt, qmeu and the guest os.
However, we want to create a consistent snapshot, so you can revert to the disk
snapshot and get a consistent file system state.
We also want to create a complete vm snapshot, including all disks and vm memory.
Libvirt and qemu provides that when given a new disk for the active layer, but
when using ceph disk, we don't change the active layer - we continue to use the
same disk.
Since 1.2.5, libvirt provides virDomainFSFreeze and virDomainFSThaw:
https://libvirt.org/hvsupport.html
So here is possible flows (ignoring engine side stuff like locking vms and disks)
Disk snapshot
-------------
1. Engine invoke VM.freezeFileSystems
2. Vdsm invokes libvirt.virDomainFSFreeze
3. Engine creates snapshot via cinder
4. Engine invokes VM.thawFileSystems
5. Vdsm invokes livbirt.virDomainFSThaw
Vm snapshot
-----------
1. Engine invoke VM.freezeFileSystems
2. Vdsm invokes libvirt.virDomainFSFreeze
3. Engine creates snapshot via cinder
4. Engine invokes VM.snapshot
5. Vdsm creates snapshot, skipping ceph disks
6. Engine invokes VM.thawFileSystems
7. Vdsm invokes livbirt.virDomainFSThaw
API changes
-----------
New verbs:
- VM.freezeFileSystems - basically invokes virDomainFSFreeze
- VM.thawFileSystems - basically invokes virDomainFSThaw
once we do it explicitly we can drop the flag from libvirt api which does it
"atomically" for us right now
also note the dependency on functional qemu-ga (that's no different from today, but
the current behavior is that when qemu-ga is not running we are quietly doing an unsafe
snapshot)
What do you think?
Nir
_______________________________________________
Devel mailing list
Devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/devel
1:40 p.m.
----- Original Message -----
From: "Michal Skrivanek"
<michal.skrivanek(a)redhat.com>
To: "Nir Soffer" <nsoffer(a)redhat.com>
Cc: "devel" <devel(a)ovirt.org>, "Eric Blake"
<eblake(a)redhat.com>
Sent: Thursday, June 25, 2015 3:44:59 PM
Subject: Re: [ovirt-devel] [VDSM] Live snapshot with ceph disks
On 19 Jun 2015, at 22:40, Nir Soffer wrote:
> Hi all,
>
> For 3.6, we will not support live vm snapshot, but this is a must for the
> next
> release.
>
> It is trivial to create a disk snapshot in ceph (using cinder apis). The
> snapshot
> is transparent to libvirt, qmeu and the guest os.
>
> However, we want to create a consistent snapshot, so you can revert to the
> disk
> snapshot and get a consistent file system state.
>
> We also want to create a complete vm snapshot, including all disks and vm
> memory.
> Libvirt and qemu provides that when given a new disk for the active layer,
> but
> when using ceph disk, we don't change the active layer - we continue to use
> the
> same disk.
>
> Since 1.2.5, libvirt provides virDomainFSFreeze and virDomainFSThaw:
> https://libvirt.org/hvsupport.html
>
> So here is possible flows (ignoring engine side stuff like locking vms and
> disks)
>
> Disk snapshot
> -------------
>
> 1. Engine invoke VM.freezeFileSystems
> 2. Vdsm invokes libvirt.virDomainFSFreeze
> 3. Engine creates snapshot via cinder
> 4. Engine invokes VM.thawFileSystems
> 5. Vdsm invokes livbirt.virDomainFSThaw
>
> Vm snapshot
> -----------
>
> 1. Engine invoke VM.freezeFileSystems
> 2. Vdsm invokes libvirt.virDomainFSFreeze
> 3. Engine creates snapshot via cinder
> 4. Engine invokes VM.snapshot
> 5. Vdsm creates snapshot, skipping ceph disks
> 6. Engine invokes VM.thawFileSystems
> 7. Vdsm invokes livbirt.virDomainFSThaw
>
> API changes
> -----------
>
> New verbs:
> - VM.freezeFileSystems - basically invokes virDomainFSFreeze
> - VM.thawFileSystems - basically invokes virDomainFSThaw
once we do it explicitly we can drop the flag from libvirt api which does it
"atomically" for us right now
We plan to add a "frozen" key in the snapshot description. If ture, it means
that engine freezed the file systems on the guest, and vdsm will skip the
VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag.
also note the dependency on functional qemu-ga (that's no
different from
today, but the current behavior is that when qemu-ga is not running we are
quietly doing an unsafe snapshot)
We plan to keep this behavior, hopefully make it better, depending on
how libvirt communicate this condition.
Current code is assuming that *any* exception calling snapshotCreateXML()
means the guest is not running :-)
Nir
3540
days inactive
3546
days old
5 comments
4 participants
participants (4)
-
Daniel Erez -
Michal Skrivanek -
Nir Soffer -
Yaniv Dary