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Shrink extended partition containing lvm

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1945 / 2 Years ago, sat, april 9, 2022, 7:42:19

I have been bashing my head against the wall, regretting ever having opted into using LVM.

Gparted screenshot]

I need to shrink the 75GB /dev/sda2/ to make room for a new OS installation. To do this, I need to shrink the /dev/sd5 partition which is contained in sd2.

I first attempted to use GParted, but my version says it does not support LVM. I downloaded the latest .iso for GParted Live into a CD, but the results were similar.

So I have already taken all the steps to shrink the filesystem, volume group, physical volume, and so on.

user@computer:~$ sudo pvs

  PV         VG     Fmt  Attr PSize  PFree   

  /dev/sda5  ubuntu lvm2 a-   56.00g 1020.00m







user@computer:~$ sudo lvdisplay 

  --- Logical volume ---

  LV Name                /dev/ubuntu/root

  VG Name                ubuntu

  LV UUID                blahblahblah

  LV Write Access        read/write

  LV Status              available

  # open                 0

  LV Size                55.00 GiB

  Current LE             14080

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           252:0

I have even removed the swap_1 volume.
When I run the latest GParted from the LiveCD, it does show the used 56GB volume group, then some 18GB unallocated space. However, it still does not let me resize /dev/sda5 or /dev/sda2. How can I resize /dev/sda2, given that the volume group and physical volumes are already 55GB, while is 18GB less than the size of the containing extended partition /dev/sd2?

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calronze

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2 Years ago

answered 2 Years ago eeperant · Accepted Answer

I fixed this by accidentally deleting the /dev/sd2 extended partition (via 'parted'--I thought, like fdisk, parted would not commit the changes immediately).

I then used testdisk to look for lost partitions. It found /dev/sd5, and considered it a primary partition. (It did not find the extended partition /dev/sd2).

After this, I was able to use gparted to resize and do operations onto the partitions.