Расширение корневого раздела LVM (CentOS 7)

Для расширения LVM раздела подготовлены два партишена (расширение диска и новый диск).

пользоваться буду SSM - system storage manager
yum install system-storage-manager

проверяем текущее состояние дисков:
ssm list
-----------------------------------------------------------------------------
Device          Free      Used      Total  Pool                   Mount point
-----------------------------------------------------------------------------
/dev/fd0                          4.00 KB
/dev/loop0                      100.00 GB
/dev/loop1                        2.00 GB
/dev/sda                         16.00 GB                         PARTITIONED
/dev/sda1                       500.00 MB                         /boot
/dev/sda2    0.00 KB  15.51 GB   15.51 GB  centos_ru1linuxtest02
/dev/sdb                         24.00 GB
/dev/sdb1   36.00 MB  15.96 GB   16.00 GB  centos_ru1linuxtest02
/dev/sdb2                         8.00 GB
/dev/sdc                         16.00 GB
/dev/sdc1                         1.00 KB
-----------------------------------------------------------------------------
------------------------------------------------------------------
Pool                   Type  Devices      Free      Used     Total
------------------------------------------------------------------
centos_ru1linuxtest02  lvm   2        36.00 MB  31.47 GB  31.50 GB
------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------
Volume                           Pool                   Volume size  FS     FS size       Free  Type    Mount point
-------------------------------------------------------------------------------------------------------------------
/dev/centos_ru1linuxtest02/root  centos_ru1linuxtest02     29.87 GB  xfs   29.86 GB   25.08 GB  linear  /
/dev/centos_ru1linuxtest02/swap  centos_ru1linuxtest02      1.60 GB                             linear
/dev/loop0                                                100.00 GB  xfs    9.99 GB    9.99 GB
/dev/sda1                                                 500.00 MB  xfs  496.67 MB  283.60 MB  part    /boot
-------------------------------------------------------------------------------------------------------------------
новые диски присутствуют, но не используются.

добавляем их в LVM
ssm add -p centos_ru1linuxtest02 /dev/sdb2
  Physical volume "/dev/sdb2" successfully created.
  Volume group "centos_ru1linuxtest02" successfully extended
ssm add -p centos_ru1linuxtest02 /dev/sdc1
  Physical volume "/dev/sdc1" successfully created.
  Volume group "centos_ru1linuxtest02" successfully extended

и расширяем полезное пространство

ssm resize -s+24G /dev/centos_ru1linuxtest02/root
  Size of logical volume centos_ru1linuxtest02/root changed from 29.87 GiB (7646 extents) to 53.87 GiB (13790 extents).
  Logical volume centos_ru1linuxtest02/root successfully resized.

результат:
ssm list
-----------------------------------------------------------------------------
Device          Free      Used      Total  Pool                   Mount point
-----------------------------------------------------------------------------
/dev/fd0                          4.00 KB
/dev/loop0                      100.00 GB
/dev/loop1                        2.00 GB
/dev/sda                         16.00 GB                         PARTITIONED
/dev/sda1                       500.00 MB                         /boot
/dev/sda2    0.00 KB  15.51 GB   15.51 GB  centos_ru1linuxtest02
/dev/sdb                         24.00 GB
/dev/sdb1    0.00 KB  16.00 GB   16.00 GB  centos_ru1linuxtest02
/dev/sdb2   28.00 MB   7.97 GB    8.00 GB  centos_ru1linuxtest02
/dev/sdc                         16.00 GB
/dev/sdc1    0.00 KB  16.00 GB   16.00 GB  centos_ru1linuxtest02
-----------------------------------------------------------------------------
------------------------------------------------------------------
Pool                   Type  Devices      Free      Used     Total
------------------------------------------------------------------
centos_ru1linuxtest02  lvm   4        28.00 MB  55.47 GB  55.50 GB
------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------
Volume                           Pool                   Volume size  FS     FS size       Free  Type    Mount point
-------------------------------------------------------------------------------------------------------------------
/dev/centos_ru1linuxtest02/root  centos_ru1linuxtest02     53.87 GB  xfs   29.86 GB   25.07 GB  linear  /
/dev/centos_ru1linuxtest02/swap  centos_ru1linuxtest02      1.60 GB                             linear
/dev/loop0                                                100.00 GB  xfs    9.99 GB    9.99 GB
/dev/sda1                                                 500.00 MB  xfs  496.67 MB  283.60 MB  part    /boot
-------------------------------------------------------------------------------------------------------------------

df -h
Filesystem                              Size  Used Avail Use% Mounted on
/dev/mapper/centos_ru1linuxtest02-root   54G  4.8G   50G   9% /