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Subject: Re: [pve-devel] About PVE Backup Integration Guide
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From: Prashant Patil <Prashant.Gamepatil@veritas.com>
To: Fiona Ebner <f.ebner@proxmox.com>, Proxmox VE development discussion
<pve-devel@lists.proxmox.com>, Thomas Lamprecht <t.lamprecht@proxmox.com>
CC: Anuradha Joshi <Anuradha.Joshi@veritas.com>, Sudhir Subbarao
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Subject: RE: [pve-devel] About PVE Backup Integration Guide
Thread-Topic: [pve-devel] About PVE Backup Integration Guide
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Date: Mon, 17 Mar 2025 07:02:47 +0000
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> The block tracking is ideally done via QEMU, then you don't require any s=
pecial features for the underlying storages.
Yes, we were able to get sector map of disks present on 'Directory' storage=
type. However, for other storage types such as lvm, lvm-thin, zfs which su=
pports raw disk format, here we could get entire disk as allocated which is=
not the case in real. I could not find much information on this, hence wan=
ted to know whether this by-design behaviour or we are missing something? P=
asting output of qemu-img map below for the 2 GB disk on zfs. Have also tri=
ed getting map over ndb but got the same result. Is there anything that we =
are missing here?
root@be-proxmox1:/dev/pve# qemu-img map -f raw --output=3Djson /dev/zvol/zf=
s1/vm-105-disk-2
[{ "start": 0, "length": 2147483648, "depth": 0, "present": true, "zero": f=
alse, "data": true, "compressed": false, "offset": 0}]
> certain storage types do not support snapshots. In such cases, what is th=
e recommended way to take backup of the running VM?
As mentioned earlier, we have found few storage devices which does not supp=
ort snapshot, but have found that we can take individual disk snapshot thro=
ugh 'blockdev-snapshot-sync'. If we have to take backup of the VM, then are=
we supposed to use this command to snapshot all VM disks?
Thanks
Prashant
-----Original Message-----
From: Fiona Ebner <f.ebner@proxmox.com>
Sent: 10 March 2025 02:44 PM
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>; Thomas=
Lamprecht <t.lamprecht@proxmox.com>
Cc: Prashant Patil <Prashant.Gamepatil@veritas.com>; Anuradha Joshi <Anurad=
ha.Joshi@veritas.com>; Sudhir Subbarao <Sudhir.Subbarao@veritas.com>; Jason=
Voneberstein <Jason.vonEberstein@veritas.com>
Subject: Re: [pve-devel] About PVE Backup Integration Guide
CAUTION: This email originated from outside the organization. Do not click =
links or open attachments unless you recognize the sender and know the cont=
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Am 05.03.25 um 07:36 schrieb Prashant Patil via pve-devel:
> 1. How much part of the plugins method is done?
It is an initial, functional version of the API.
> 2. How soon we can start the integration?
The patches were not applied yet, feedback is welcome. As Thomas already sa=
id "We would be open to fast-track this effort for inclusion with feedback =
from backup vendors". I'll see if I can get around to post a rebased versio=
n this week.
> 3. Is there any plugin method's documentation already available? If ye=
s, could you please share?
It's part of the patches, see:
https://lore.proxmox.com/pve-devel/20241114150754.374376-10-f.ebner@proxmox=
.com/
> 1. How to get allocated blocks/sectors from the snapshot of the raw fo=
rmat virtual disk attached to a running VM (disk present on the block based=
storage such as lvm, lvm-thin, etc)?
> 2. How to get allocated blocks/sectors from the snapshot of the vmdk f=
ormat virtual disk attached to a running VM?
> 3. As per below link, certain storage types do not support snapshots. =
In such cases, what is the recommended way to take backup of the running VM=
?
The block tracking is ideally done via QEMU, then you don't require any spe=
cial features for the underlying storages. You can also do dirty tracking f=
or incremental backups. See the following for how this is done internally w=
ith the proposed API:
https://lore.proxmox.com/pve-devel/20241114150754.374376-4-f.ebner@proxmox.=
com/
https://lore.proxmox.com/pve-devel/20241114150754.374376-5-f.ebner@proxmox.=
com/
Best Regards,
Fiona
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