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Re: add disk to LVM

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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

#236519 — 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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#236528

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On Sun, Jun 27, 2021 at 11:10:21AM +0100, mick crane wrote:
> On 2021-06-27 10:32, tomas@tuxteam.de wrote:
> >
> >>/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.
> >
> >Cheers
> > - t
> 
> Thanks, I'll leave the LVM alone.
> Where would I stop the automagical mounting of the disk ...

This depends on who or what is automounting your disk.
AFAIK there are several possibilities (I use none, so take my
knowledge with two fists of salt). Perhaps your system log tells
you what is doing the automounting.

> and mount it on a directory at boot ?

Wait: this is orthogonal to the above. Usually, whatever you want
mounted at boot is in /etc/fstab (or, perhaps, in some systemd
unit files, although I'm more-than-hazy on this one). But this
wouldn't make much sense with removable media, I guess.

But you can choose to do none of the above (in my case, I always
mount removable media explicitly.

Cheers
 - t

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#236529

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On Du, 27 iun 21, 13:30:06, tomas@tuxteam.de wrote:
> On Sun, Jun 27, 2021 at 11:10:21AM +0100, mick crane wrote:
> 
> > and mount it on a directory at boot ?
> 
> Wait: this is orthogonal to the above. Usually, whatever you want
> mounted at boot is in /etc/fstab (or, perhaps, in some systemd
> unit files, although I'm more-than-hazy on this one). But this
> wouldn't make much sense with removable media, I guess.

While systemd does have .mount units, according to systemd.mount(5) the 
preferred approach is to use /etc/fstab.

For a removable drive make sure to add 'nofail' to the entry, otherwise 
the system won't boot if the drive is not present.


Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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