Notes on expanding the capacity of CentOS partition in VMware virtual machine

Time:2020-10-26

Due to the insufficient root partition planning of dev-vhost017, only 10g is needed. (based on LVM)

First shut down dev-vhost017, and then adjust the root partition hard disk 10g to 50g in vSphere client
2016228120628091.png (684×287)

Turn on the virtual machine
Original / size 10g

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The code is as follows:

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_centos6-lv_root
                      8.3G  4.0G  3.9G  51% /
tmpfs                 939M   12K  939M   1% /dev/shm
/dev/sda1             477M   57M  396M  13% /boot

View disk SDA expanded to 50g

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The code is as follows:

[[email protected] ~]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
         switch off the mode (command ‘c’) and change display units to
         sectors (command ‘u’).
 
Command (m for help): p
 
Disk /dev/sda: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0007ef5b
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        1306     9972736   8e  Linux LVM
 
Disk /dev/mapper/vg_centos6-lv_root: 9135 MB, 9135194112 bytes
255 heads, 63 sectors/track, 1110 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/mapper/vg_centos6-lv_swap: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

View LVM status

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The code is as follows:

  PV         VG         Fmt  Attr PSize PFree
  /dev/sda2  vg_centos6 lvm2 a–  9.51g    0

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The code is as follows:

  VG         #PV #LV #SN Attr   VSize VFree
  vg_centos6   1   2   0 wz–n- 9.51g    0

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The code is as follows:

  LV      VG         Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_root vg_centos6 -wi-ao—- 8.51g                                                  
  lv_swap vg_centos6 -wi-ao—- 1.00g

Partition / dev / sda3

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The code is as follows:

[[email protected] ~]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
         switch off the mode (command ‘c’) and change display units to
         sectors (command ‘u’).
 
Command (m for help): p
 
Disk /dev/sda: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0007ef5b
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        1306     9972736   8e  Linux LVM
/dev/sda3            1306        6527    41942367+  83  Linux

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The code is as follows:

[[email protected] ~]# partprobe

Restart virtual machine format / dev / sda3

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The code is as follows:

[[email protected] ~]# mkfs.ext4 /dev/sda3

LVM expansion

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The code is as follows:

[[email protected] ~]# pvcreate /dev/sda3

  Physical volume “/dev/sda3” successfully created
 

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The code is as follows:

  PV         VG         Fmt  Attr PSize  PFree
  /dev/sda2  vg_centos6 lvm2 a–   9.51g     0
  /dev/sda3             lvm2 —  40.00g 40.00g
 

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The code is as follows:

[ [email protected] ~]# vgextend /dev/mapper/vg_ Centos6 / dev / sda3 (note group name)

  Volume group “vg_centos6” successfully extended
 

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The code is as follows:

[[email protected] ~]# lvextend -L 39.9G /dev/vg_centos6/lv_root /dev/sda3

  Rounding size to boundary between physical extents: 39.90 GiB
  Size of logical volume vg_centos6/lv_root changed from 8.51 GiB (2178 extents) to 39.90 GiB (10215 extents).
  Logical volume lv_root successfully resized
 
 

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The code is as follows:

[[email protected] ~]# resize2fs /dev/vg_centos6/lv_root

resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_centos6/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 3
Performing an on-line resize of /dev/vg_centos6/lv_root to 10460160 (4k) blocks.
The filesystem on /dev/vg_centos6/lv_root is now 10460160 blocks long.
 
 

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The code is as follows:

  PV         VG         Fmt  Attr PSize  PFree
  /dev/sda2  vg_centos6 lvm2 a–   9.51g    0
  /dev/sda3  vg_centos6 lvm2 a–  40.00g 8.60g

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The code is as follows:

  VG         #PV #LV #SN Attr   VSize  VFree
  vg_centos6   2   2   0 wz–n- 49.50g 8.60g

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The code is as follows:

  LV      VG         Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_root vg_centos6 -wi-ao—- 39.90g                                                  
  lv_swap vg_centos6 -wi-ao—-  1.00g 
 

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The code is as follows:

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_centos6-lv_root
                       40G  4.0G   34G  11% /
tmpfs                 939M   12K  939M   1% /dev/shm
/dev/sda1             477M   57M  396M  13% /boot