Unable to resize a logical volume due to wrong reported asked size

Unable to resize a logical volume due to wrong reported asked size

[François-Xavier Payet]

Hello!

I’ve got issues resizing a LVM volume.

I’ve allready resized the filesystem on top of it without issues : 
btrfs fi resize 62T /mnt/user
Resize device id 1 (/dev/mapper/vg_raid-datas) from 80.04TiB to 62.00TiB

But when trying to resize the underlying volume, I’ve got the following error : 
lvresize -L63T /dev/vg_raid/datas
  File system btrfs found on vg_raid/datas.
  File system size (62,00 TiB) is larger than the requested size (1,00 TiB).
  File system reduce is required and not supported (btrfs).

Which makes (to me) no sense as 1. the FS is less than 63T, 2. The 1.00 TB is not what I’ve requested. And If I try another size, it tells me that I’ve asked for a null size : 
lvresize -L64T /dev/vg_raid/datas
  File system btrfs found on vg_raid/datas.
  File system size (62,00 TiB) is larger than the requested size (0   ).
  File system reduce is required and not supported (btrfs).

So I really don’t get what’s going on here. Anyone has pointer on what might be the problem?

Thanks!

Re: Unable to resize a logical volume due to wrong reported asked size

[David Teigland]

On Thu, Jan 04, 2024 at 10:01:04PM +0100, François-Xavier Payet wrote:
> Hello!
> 
> I’ve got issues resizing a LVM volume.

Hi, I suspect you're missing this fix:
https://gitlab.com/lvmteam/lvm2/-/commit/fa496513010976aac21584b5081529b76462f9a9

To work around the problem, you can disable the fs checking in lvresize
with '--fs ignore', which tells lvresize that you have already properly
resized the fs.

Dave

> I’ve allready resized the filesystem on top of it without issues : 
> btrfs fi resize 62T /mnt/user
> Resize device id 1 (/dev/mapper/vg_raid-datas) from 80.04TiB to 62.00TiB
> 
> But when trying to resize the underlying volume, I’ve got the following error : 
> lvresize -L63T /dev/vg_raid/datas
>   File system btrfs found on vg_raid/datas.
>   File system size (62,00 TiB) is larger than the requested size (1,00 TiB).
>   File system reduce is required and not supported (btrfs).
> 
> Which makes (to me) no sense as 1. the FS is less than 63T, 2. The 1.00 TB is not what I’ve requested. And If I try another size, it tells me that I’ve asked for a null size : 
> lvresize -L64T /dev/vg_raid/datas
>   File system btrfs found on vg_raid/datas.
>   File system size (62,00 TiB) is larger than the requested size (0   ).
>   File system reduce is required and not supported (btrfs).
> 
> So I really don’t get what’s going on here. Anyone has pointer on what might be the problem?
> 
> Thanks!

Re: Unable to resize a logical volume due to wrong reported asked size

[François-Xavier Payet]

> 
> To work around the problem, you can disable the fs checking in lvresize
> with '--fs ignore', which tells lvresize that you have already properly
> resized the fs.
> 
> Dave
> 
That did it. I was afraid of doing it beforehand because I thought it would effectively resize the logical volume to 1T, but it worked like a charm.

THanks Dave