[pbs-devel] [PATCH docs 1/3] docs: explain the working principle of the change detection modes

[Christian Ebner]

On 11/26/24 10:22, Thomas Lamprecht wrote:
> Am 26.11.24 um 08:29 schrieb Christian Ebner:
>> On 11/25/24 22:09, Thomas Lamprecht wrote:
>> Okay, will also add a short note that since the legacy mode and the two
>> other modes use different archive formats, they do not reuse chunks as
>> efficiently when using mixed modes on the same datastore.
> 
> Fine I guess, but this wasn't really what I had in mind here, and I would
> not "bad-mouth" your nice work here too much hehe.

Well, no intention in bad mouthing it ;)

Nevertheless, I would not refrain from mentioning this as there was some 
feedback regarding increased size usage after switching modes (cannot 
find the relevant forum thread at the moment). So letting users know 
that they might take a closer look at the datastore disk usage after 
switching to one of the new modes can only help.

> In the forum there was just some confusion about three change-modes maybe
> meaning three formats. I.e., more that the data one replaces the legacy one
> with the benefit of being able to seamlessly switch to metadata mode and back
> again, as both use the same archive format/structure.
> 
>>> This mail is inspired a bit from the post I replied here:
>>>
>>> https://forum.proxmox.com/threads/proxmox-ve-8-3-released.157793/page-2#post-723212
> 
> ^- if my reply was (hopefully) somewhat clear maybe something of it can be
> used as base.
> 

I did already send a patch [0], but only loosely followed your reply in 
the forum thread. Maybe we can improve based on that?

[0] 
https://lore.proxmox.com/pbs-devel/20241126085502.77438-1-c.ebner@proxmox.com/T/#u