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

[David Teigland <teigland@redhat.com>]

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!