How to manage multiple disks based on LVM in Centos 7

• Overview
• • Installation phase
  • Command line

Overview

Installation phase

Command line

[[email protected] ~]# lsblk -l
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda           8:0    0    80G  0 disk 
sda1          8:1    0   200M  0 part /boot/efi
sda2          8:2    0     1G  0 part /boot
sda3          8:3    0  78.8G  0 part 
centos-root 253:0    0    50G  0 lvm  /
centos-swap 253:1    0   7.9G  0 lvm  [SWAP]
centos-home 253:2    0 180.9G  0 lvm  /home
sdb           8:16   0   160G  0 disk 
sdb1          8:17   0   160G  0 part 
centos-home 253:2    0 180.9G  0 lvm  /home
sr0          11:0    1  1024M  0 rom  
[[email protected] ~]# 

           

[[email protected] ~]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: gpt
Disk identifier: 5AD14517-8968-4A36-B68E-07A37AC25541


#         Start          End    Size  Type            Name
 1         2048       411647    200M  EFI System      EFI System Partition
 2       411648      2508799      1G  Microsoft basic 
 3      2508800    167770111   78.8G  Linux LVM       
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sdb: 171.8 GB, 171798691840 bytes, 335544320 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: gpt
Disk identifier: F9313319-724A-4FD6-9A2E-2284462B5E67


#         Start          End    Size  Type            Name
 1         2048    335542271    160G  Linux LVM       

Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 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 /dev/mapper/centos-swap: 8455 MB, 8455716864 bytes, 16515072 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 /dev/mapper/centos-home: 194.3 GB, 194259189760 bytes, 379412480 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

[[email protected] ~]# 

           

[[email protected] ~]# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               centos
  PV Size               78.80 GiB / not usable 2.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              20173
  Free PE               1
  Allocated PE          20172
  PV UUID               epfbrQ-7QuS-ueZ1-iSfP-pRjU-6J3z-BNsZkZ
   
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               centos
  PV Size               <160.00 GiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              40959
  Free PE               0
  Allocated PE          40959
  PV UUID               MkuvrW-IdAf-THjX-1ZH7-a1pj-lPai-wwSz3M
   
[[email protected] ~]# 
[[email protected] ~]# vgdisplay 
  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               <238.80 GiB
  PE Size               4.00 MiB
  Total PE              61132
  Alloc PE / Size       61131 / 238.79 GiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               rB43hL-tOEC-hvTm-2FeA-g3su-cGGS-rl8Suv
   
[[email protected] ~]# 
[[email protected] ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                CFZ9Ix-g3vx-tfT1-ooiR-CS3h-pXoR-UM4AP5
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-11-19 01:20:43 -0500
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/centos/home
  LV Name                home
  VG Name                centos
  LV UUID                hwz5Gy-I0q3-nGc2-jWx0-SKBx-m2yy-CqFevB
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-11-19 01:20:44 -0500
  LV Status              available
  # open                 1
  LV Size                <180.92 GiB
  Current LE             46315
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2
   
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                NCHXcb-1xRf-DnSS-UsYd-sSpa-HI9n-fc5nDS
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-11-19 01:20:44 -0500
  LV Status              available
  # open                 2
  LV Size                <7.88 GiB
  Current LE             2016
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:1
   
[[email protected] ~]# 
[[email protected] ~]# cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Tue Nov 19 01:20:45 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=dd63ad8c-1457-4774-a301-543994b639cd /boot                   xfs     defaults        0 0
UUID=9B95-B5C6          /boot/efi               vfat    umask=0077,shortname=winnt 0 0
/dev/mapper/centos-home /home                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0
[[email protected] ~]#