dean a écrit : > > On 07/09/15 17:42, Pascal Hambourg wrote: > >> Because you selected LVM in the assisted mode, which messes up sizes and >> does not leave any free extents for future growth. You can still reduce >> an oversized LV to free some extents but if the filesystem is ext2/3/4 >> it cannot be reduced online so it must be unmounted first. Depending on >> the mount point, it may require to switch to single user mode or boot >> from a maintenance system. > > Resize2fs is quite good at online resizing, not sure i'd do it on / but > i have lvresize and resize2fs /home and others many times without issue.
resizefs can extend a mounted filesystem but can reduce only an unmounted filesystem. It is safe to extend / online, but you cannot of course unmount / in the running system to reduce it. Note that btrfs allows both online extension and reduction.