On Mon, Jan 22, 2024 at 03:40:06PM +0000, Alain D D Williams wrote: > On Mon, Jan 22, 2024 at 10:29:55AM -0500, Stefan Monnier wrote: > > > lvextend --size +1G --resizefs /dev/mapper/localhost-home > > > > > > Ie get lvextend to do the maths & work it out for me. > > > > > > Those who are cleverer than me might be able to tell you how to get it > > > right > > > first time! > > > > lvreduce --size -50G --resizefs /dev/mapper/localhost-home > > Oh, even better. It is a long time since I looked at than man page. > > Does this still need to be done with the file system unmounted or can it be > done with an active file system these days ?
You have first to shrink the file system (if it's ext4, you can use resize2fs: note that you can only *grow* an ext4 which is mounted (called "online resizing) -- to *shrink* it, it has to be unmounted. Since I wasn't quite sure whether ext2's Gs are the same as LVM's and didn't want to bother with whatever clippings each process takes, what I did in this situation was: - shrink (resize2fs) the file system to a size clearly below target - resize the LVM to my target size - resize2fs again without params, which lets it take whatever the partition offers Sounds complicated, but is not :-) You can shrink the partition to be smaller than the file system, but then you'll thrash it sooner or later, when two file sysems start quibbling over blocks on the fence like angry neighbours :) Cheers -- t
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