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add disk to LVM



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

/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.

What would be the way to do that using LVM ?
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. Or how would I move the whole of /home to /dev/sdb1 and make it as new logical volume mounted on /home?
mick
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