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Today's Topics:
1. Re: Revisited: External disk backup using PBS - Requesting
Criticism/Advice? (Lindsay Mathieson)
2. PBS Incremental and stopped VM's (Lindsay Mathieson)
3. Re: PBS Incremental and stopped VM's (Arjen)
4. Re: PBS Incremental and stopped VM's (Lindsay Mathieson)
----------------------------------------------------------------------
Message: 1
Date: Sat, 10 Apr 2021 23:28:50 +1000
From: Lindsay Mathieson <lindsay.mathie...@gmail.com>
To: pve-user@lists.proxmox.com
Subject: Re: [PVE-User] Revisited: External disk backup using PBS -
Requesting Criticism/Advice?
Message-ID: <e92b8b56-e89f-928d-a3c8-7b423e334...@gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 10/04/2021 5:10 pm, Arjen via pve-user wrote:
Don't expect to be able to backup the PBS container with 4TB to a 2TB
external drive.
I only passed 2TB through and the actual backup data comes to 1.3TB
The Datastore of a PSB does not compress much further and Proxmox VE
Backup will only backup virtual disks and not mountpoints or storages
passed from host, if I understand correctly.
I wondered that. Will be testing.
I suggest adding a virtual disk of 2TB to the PBS container (and format
it with ext4) which can be backed up by the Proxmox VE Backup.
Certainly a possibility.
I also wondered if it was practical to attach an external disk to PBS as
a Datastore, then detach it. A bit more manual, but doable.
I would also run the PBS container (with virtual disk) on the cluster
instead on separate hardware which is a single point of failure. The local
PBS would be then just as reliable as your cluster.
I want to keep the storage separate from the cluster, in that regard the
local storage is a single point of failure, hence the need for offsite
storage as well :)
Regarding safeness: I suggest doing a automated disaster recovery every
week to make sure it works as expected. Or at least partially, like
restoring the PBS from an external drive.
I'll definitely be testing restore options to check that it works.
Regarding practicality: I would have a remote PBS sync with your local
PBS instead of moving physical disks (but you mentioned before that that
was not really possible).
Alas :(
Perhaps I could do a backup on site, then physically move it offsite and
attach it to a offsite PBS server and then sync it remotely -
incremental backups over the net would be doable.
nb. Our NAS died, hence my increased investigation of this :) Definitely
want to go with a more open and targeted solution this time, the NAS was
a good appliance, but inflexible.
Thanks!
--
Lindsay
------------------------------
Message: 2
Date: Sat, 10 Apr 2021 23:36:23 +1000
From: Lindsay Mathieson <lindsay.mathie...@gmail.com>
To: pve-user@lists.proxmox.com
Subject: [PVE-User] PBS Incremental and stopped VM's
Message-ID: <ddef627d-5c5f-1358-4a9f-196ef5868...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
I'm guessing only running VM's (with dirty bitmap support) can be
incrementally backed up?
Might be nice if we could schedule backups for only running VM's
--
Lindsay
------------------------------
Message: 3
Date: Sat, 10 Apr 2021 13:43:43 +0000
From: Arjen <leeste...@protonmail.ch>
To: Proxmox VE user list <pve-user@lists.proxmox.com>
Subject: Re: [PVE-User] PBS Incremental and stopped VM's
Message-ID:
<yl4Q_yt8NBMZUuS35KwBK-5RtAEv6V0dJTE77Hp8lW3GAxzIAOU2ErfF0CMHI9y8NjUQKF5TBtgSGhQIaE3p5Sy-7ltAFX8NmbZJoSyHVAk=@
protonmail.ch>
Content-Type: text/plain; charset=utf-8
On Saturday, April 10th, 2021 at 15:36, Lindsay Mathieson <
lindsay.mathie...@gmail.com> wrote:
I'm guessing only running VM's (with dirty bitmap support) can be
incrementally backed up?
Might be nice if we could schedule backups for only running VM's
Just to be clear: PBS always makes a full backup. The resulting data is
deduplicated (before sending it to the server), which almost always reduces
the writes to the server. An administration of changed virtual disk blocks
is kept for running VMs, which only reduces the reads from VMs that have
not been restarted between backups. It data transfer over the network is
the bottleneck, you will have most benefit from the former (less changes,
less transfers). The latter only speeds up the backup due to less reads (of
unchanged data) from disk.
best regards, Arjen
------------------------------
Message: 4
Date: Sun, 11 Apr 2021 00:06:19 +1000
From: Lindsay Mathieson <lindsay.mathie...@gmail.com>
To: pve-user@lists.proxmox.com
Subject: Re: [PVE-User] PBS Incremental and stopped VM's
Message-ID: <90b0f7df-ca15-f9cd-b76a-0f8f26e24...@gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 10/04/2021 11:43 pm, Arjen via pve-user wrote:
Just to be clear: PBS always makes a full backup. The resulting data is
deduplicated (before sending it to the server), which almost always reduces
the writes to the server.
Ah, I see now, thanks, I didn't understand that part of things. Looking
at the logs of my 2nd backup, I see that stopped VM's had zero bytes
written to the backup server.
--
Lindsay
------------------------------
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