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Ampliar disco en maquina virtual KVM con CENTOS 6

Este servidor usa LVM así que:

Hemos ampliado partición (growpart)
Hemos ampliado Physical Volume (pvresize)
Hemos ampliado Logical Volume (lvresize)
Hemos ampliado el sistema de ficheros (parámetro –resizefs)

Resize kvm disk,

Ampliar disco QEMU

[root@host00 ~]# fdisk -l

Disk /dev/sda: 45.1 GB, 45097156608 bytes
64 heads, 32 sectors/track, 43008 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00048d54

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           2         501      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2             502       32768    33041408   8e  Linux LVM
Partition 2 does not end on cylinder boundary.


1. Detectar el cambio de tamaño

# dmesg | grep ^sd
sd 2:0:0:0: Capacity data has changed
sd 2:0:0:0: [sda] 88080384 512-byte logical blocks: (45.0 GB/42.0 GiB)
sda: detected capacity change from 39728447488 to 45097156608

2. Identificar las particiones

# fdisk -l /dev/sda | grep ^/dev
/dev/sda1   *           2         501      512000   83  Linux
/dev/sda2             502       32768    33041408   8e  Linux LVM

3. Ampliar la partición

# yum install cloud-utils-growpart

# growpart /dev/sda 2
CHANGED: partition=2 start=1026048 old: size=66082816 end=67108864 new: size=87054336,end=88080384

4. Comprobar

[root@host00 ~]# fdisk -l

Disk /dev/sda: 45.1 GB, 45097156608 bytes
64 heads, 32 sectors/track, 43008 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00048d54

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           2         501      512000   83  Linux
/dev/sda2             502       43008    43527168   8e  Linux LVM

# lsblk
NAME                         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0                           11:0    1 1024M  0 rom  
sda                            8:0    0   42G  0 disk 
├─sda1                         8:1    0  500M  0 part /boot
└─sda2                         8:2    0 41.5G  0 part 
  ├─vg_host00-lv_root (dm-0) 253:0    0 28.3G  0 lvm  /
  └─vg_host00-lv_swap (dm-1) 253:1    0  3.2G  0 lvm  [SWAP]

Si no muestra el nuevo tamaño de sda2 hay que reiniciar (depende del kernel)

5. Ampliar PV

Antes:
# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_host00
  PV Size               31.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              8066
  Free PE               0
  Allocated PE          8066
  PV UUID               maTvB5-mEvj-vhlw-CfFj-RAlg-e0ME-rcANuv

Ampliar:
# pvresize -v /dev/sda2
    Using physical volume(s) on command line.
    Wiping cache of LVM-capable devices
    Wiping internal VG cache
    Archiving volume group "vg_host00" metadata (seqno 4).
    Resizing volume "/dev/sda2" to 87054336 sectors.
    Resizing physical volume /dev/sda2 from 0 to 10626 extents.
    Updating physical volume "/dev/sda2"
    Creating volume group backup "/etc/lvm/backup/vg_host00" (seqno 5).
  Physical volume "/dev/sda2" changed
  1 physical volume(s) resized / 0 physical volume(s) not resized

Después:
# pvdisplay 
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_host00
  PV Size               41.51 GiB / not usable 2.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              10626
  Free PE               2560
  Allocated PE          8066
  PV UUID               maTvB5-mEvj-vhlw-CfFj-RAlg-e0ME-rcANuv
 
6. Ampliar el LV

# lvdisplay /dev/vg_host00/lv_root
  --- Logical volume ---
  LV Path                /dev/vg_host00/lv_root
  LV Name                lv_root
  VG Name                vg_host00
  LV UUID                DWRtz9-vmZt-tAXf-gaSS-Gf9b-6r8r-x3LRoX
  LV Write Access        read/write
  LV Creation host, time host00.soluciones.si, 2022-04-01 18:05:17 +0200
  LV Status              available
  # open                 1
  LV Size                28.31 GiB
  Current LE             7247
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

# lvresize --verbose --extents +100%FREE --resizefs /dev/vg_host00/lv_root
    Using volume group(s) on command line.
    Converted 100%FREE into at most 2560 physical extents.
    Executing: fsadm --verbose check /dev/vg_host00/lv_root
fsadm: "ext4" filesystem found on "/dev/mapper/vg_host00-lv_root"
fsadm: Skipping filesystem check for device "/dev/mapper/vg_host00-lv_root" as the filesystem is mounted on /
    fsadm failed: 3
    Archiving volume group "vg_host00" metadata (seqno 5).
    Extending logical volume vg_host00/lv_root to up to 38.31 GiB
  Size of logical volume vg_host00/lv_root changed from 28.31 GiB (7247 extents) to 38.31 GiB (9807 extents).
    Loading vg_host00-lv_root table (253:0)
    Suspending vg_host00-lv_root (253:0) with device flush
    Resuming vg_host00-lv_root (253:0)
    Creating volume group backup "/etc/lvm/backup/vg_host00" (seqno 6).
  Logical volume lv_root successfully resized.
    Executing: fsadm --verbose resize /dev/vg_host00/lv_root 40169472K
fsadm: "ext4" filesystem found on "/dev/mapper/vg_host00-lv_root"
fsadm: Device "/dev/mapper/vg_host00-lv_root" size is 41133539328 bytes
fsadm: Parsing tune2fs -l "/dev/mapper/vg_host00-lv_root"
fsadm: Resizing filesystem on device "/dev/mapper/vg_host00-lv_root" to 41133539328 bytes (7420928 -> 10042368 blocks of 4096 bytes)
fsadm: Executing resize2fs /dev/mapper/vg_host00-lv_root 10042368
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_host00-lv_root is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/mapper/vg_host00-lv_root to 10042368 (4k) blocks.
The filesystem on /dev/mapper/vg_host00-lv_root is now 10042368 blocks long.

# lvdisplay /dev/vg_host00/lv_root
  --- Logical volume ---
  LV Path                /dev/vg_host00/lv_root
  LV Name                lv_root
  VG Name                vg_host00
  LV UUID                DWRtz9-vmZt-tAXf-gaSS-Gf9b-6r8r-x3LRoX
  LV Write Access        read/write
  LV Creation host, time host00.soluciones.si, 2022-04-01 18:05:17 +0200
  LV Status              available
  # open                 1
  LV Size                38.31 GiB
  Current LE             9807
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0