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Re: add disk to LVM

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On Sun, Jun 27, 2021 at 09:59:50AM +0100, mick crane wrote:
> hello,
> Please bear in mind that I don't know what I'm doing.
> It looks like when I installed debian on this PC I requested a LVM.
> I'd forgotten about that.
> 
> root@pumpkin:~# df -h
> Filesystem                    Size  Used Avail Use% Mounted on
> udev                          7.8G     0  7.8G   0% /dev
> tmpfs                         1.6G  1.5M  1.6G   1% /run
> /dev/mapper/pumpkin--vg-root   28G  8.4G   18G  33% /
> tmpfs                         7.8G   36M  7.8G   1% /dev/shm
> tmpfs                         5.0M  4.0K  5.0M   1% /run/lock
> /dev/sda1                     236M  155M   69M  70% /boot
> /dev/mapper/pumpkin--vg-home  176G   18G  150G  11% /home
> tmpfs                         1.6G   60K  1.6G   1% /run/user/1000
> /dev/sdb1                     1.8T   62G  1.7T   4%
> /media/mick/a8a2440a-0739-48b3-aa85-29715dbf817d

OK. It seems (some of) /dev/sda (most probably one /dev/sda2) is
providing the storage where your "pumpkin--vg-xxx" logical volumes
live.

> /dev/sdb1 is one whole disk ext4 partition that I usually unmount
> and mount in a directory in /home to save files in. I should
> probably have added it to fstab.

OK. Not necessarily in fstab. It depends on what you want to do.

> What would be the way to do that using LVM ?

Now I don't understand your question. Do you want to use LVM on
your removable disk? If yes, why? What do you expect from it?
If not: the LVM setup you already have doesn't interfere in
any way with your external drive.

> I was concerned to be able to take out sdb and put it in another PC.
> Would the sensible thing be to make sdb1 part of the logical group,
> make a new logical volume and make a link to that from a directory
> inside /home or to extend vg-home? I was thinking that if I extend
> home you wouldn't know if some files were on one disk and some on
> another.

You could grow your space by adding the removable storage as a
physical volume to the pool, so you get a bigger logical volume,
but then you can't remove your (removable) storage. I wouldn't
recommend that.

> Or how would I move the whole of /home to /dev/sdb1 and make it as
> new logical volume mounted on /home?

I would keep the removable storage separate. Either don't do any
LVM on it, or, if you do (why?), keep it as a logical volume
onto itself. If you add it to a pool and then remove it, you end
up with two broken file system halves or similar.

Cheers
 - t

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Re: add disk to LVM <tomas@tuxteam.de> - 2021-06-27 11:40 +0200
  Re: add disk to LVM <tomas@tuxteam.de> - 2021-06-27 13:40 +0200
    Re: add disk to LVM Andrei POPESCU <andreimpopescu@gmail.com> - 2021-06-27 13:50 +0200

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