RoosBertl's Blog: Resize encrypted CentOS7 PV volume

If you ticked the checkbox "encrypt volume" during CentOS7 installation, the Disk is encrypted on the LVM PV (Physical Volume) level by CentOS using LUKS.

Therefore you need to perform this steps to grow one of the LVM partitions:

Increase the Partition of the disk
Increase the PV (physical LVM Volume)
Increase the LV (logical LVM Volume)
Increase the file system of the partition holding your data.

Steps (example using VMWare ESXi VM):

Increase the disk size in vCenter / ESXi for the VM (e.g from 750 GB to 800 GB). This can be done while the VM machine is up.
Create a snapshot of the VM
Reboot the VM

Resize the disk partition

fdisk /dev/sda

Print the partition table:

Command (m for help): p

Disk /dev/sda: 859.0 GB, 858993459200 bytes, 1677721600 sectors <--size in GiB!

Device  boot.     Start        End     Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200  1572863999   785382400   83  Linux <-- Holds the LVM vols.

Now delete the partition (not kidding):

Command (m for help): d
Partition number (1,2, default 2): 2

Re-create the partion with larger size:

Command (m for help): n
 Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): p
Partition number (2-4, default 2): 2
First sector (2099200-1677721599, default 2099200): [ENTER]
Using default value 2099200
Last sector, +sectors or +size{K,M,G} (2099200-1677721599, default 1677721599): [ENTER]
Using default value 1677721599
Partition 2 of type Linux and of size 799 GiB is set

Check the partition table:

Command (m for help): p

Disk /dev/sda: 859.0 GB, 858993459200 bytes, 1677721600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000f06d8

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200  1677721599   837811200   83  Linux   <-- New size

Write the partition table and exit:
```
Command (m for help): w
```

reboot

Resize the PV (LVM Physical Volume):

Display the PV volumes:

[root@localhost]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/mapper/luks-999a99b9-8a99-9abc-d999-b99bb9999bb9
  VG Name               cl
  PV Size               <749,00 GiB / not usable 0
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              191743
  Free PE               1
  Allocated PE          191742
  PV UUID               Zu21Ve-7mx5-v4p2-bxfa-ZH2N-EbWE-WeMk3T

Resize the PV (to the maximum available)

[root@localhost]# pvresize /dev/mapper/luks-999a99b9-8a99-9abc-d999-b99bb9999bb9

Physical volume "/dev/mapper/luks-999a99b9-8a99-9abc-d999-b99bb9999bb9" changed
1 physical volume(s) resized / 0 physical volume(s) not resized

check the PV:

[root@localhost]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/mapper/luks-999a99b9-8a99-9abc-d999-b99bb9999bb9
  VG Name               cl
  PV Size               <799,00 GiB / not usable 1,00 MiB
  Allocatable           yes
  PE Size               4,00 MiB
  Total PE              204543
  Free PE               12801
  Allocated PE          191742
  PV UUID               Zu21Ve-7mx5-v4p2-bxfa-ZH2N-EbWE-WeMk3T

Resize LV (logical volume):

Display the Logical volume(s):

[root@localhost]# lvdisplay
 ...
 --- Logical volume ---
  LV Path                /dev/cl/DATA
  LV Name                DATA2
  VG Name                cl
  LV UUID                X8AAA-4aAa-Aaaa-8A8A-BbbB-bb8b-bbB8BB
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2018-02-02 09:50:26 +0400
  LV Status              available
  # open                 1
  LV Size                <411,12 GiB
  Current LE             105246
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:8

Resize the LV:

[root@localhost]# lvresize --size +50G /dev/cl/DATA

Size of logical volume cl/DATA changed from <411,12 GiB (105246 extents) to <461,12 GiB (118046 extents).
Logical volume cl/DATA successfully resized.

Check the LV partition:

[root@localhost]# lvdisplay
  ...
  --- Logical volume ---
  LV Path                /dev/cl/DATA
  LV Name                DATA2
  VG Name                cl
  LV UUID                X8AAA-4aAa-Aaaa-8A8A-BbbB-bb8b-bbB8BB
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2018-02-02 09:50:26 +0400
  LV Status              available
  # open                 1
  LV Size                <461,12 GiB
  Current LE             118046
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:8

Resize file system (can be done on-the-fly without unmount if it is XFS):

[root@localhost]# xfs_growfs /dev/cl/DATA

meta-data=/dev/mapper/cl-DATA2   isize=512    agcount=4, agsize=26942976 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=107771904, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =Intern                 bsize=4096   blocks=52623, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =keine                  extsz=4096   blocks=0, rtextents=0
Datablocks changed from 107771904 to 120879104.

RoosBertl's Blog

Tuesday, February 13, 2018

Resize encrypted CentOS7 PV volume

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