RAID expand - LVM-thin expand & resize

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dindon_tv

New Member
Sep 16, 2025
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Good morning !
Kinda new to Proxmox, i'm an IT admin working on this beautiful solution to avoid using VMware.

I've deployed some servers for now, standalone and all with RAID card (mostly DELL server).

I have a T130 at home with a H330 RAID card, at first, I had 2 x 2To HDD in RAID1 for standard storage) and upgrade to 2 X 4To.
The RAID expand worked perfectly, it now finds me in the disk section the 4To RAID size.
1758056816485.png

But it's still 2To size on the LVM-Thin :
1758056875074.png

I find solutions to expand the size of the LVM-Thin to use all capacity avaliable, but it's not told if datas are lost or not.
BTW I have backups, so if datas are lost, it's just a big filer VM to restore, it will take a week-end and not a big deal, just need to plan it (wife & kids won't be happy if not planned ...).

Found this to help me : https://www.youtube.com/watch?v=9ntPaLcf1eQ just don't understand how to calculate the metadata size expand (+3GB ?) in this case.

Thanks for your help !
Regards,
DinDon
 
Hi @dindon_tv , welcome to the forum.

dindon_tv said:
I find solutions to expand the size of the LVM-Thin to use all capacity avaliable, but it's not told if datas are lost or not.
Click to expand...
If the steps are executed properly, you should not loose the data.

There are many threads on the forum about this, for example:
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[SOLVED] Thread 'Increase local-lvm and VM disk size'

Hi All,

I'm sure you all have done and tested what I'm trying to achieve here!

I wanted to test/simulate the following:
My Scenario:
1. My Windows VM disk size is almost full and wanted to increase the disk size.
2. I have no available space on my local-lvm disk.
3. The only way to increase the disk's capacity is to add 1 new physical disk to the server's RAID. <--- This part I know what to do (Dell server).

Questions:
1. Once the server RAID disk is increased, what are the steps to check and increase the local-lvm disk?
2. Steps to...


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