How to adjust the disk size of Linux virtual machines under XenServer

Source: Internet
Author: User
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  1. Log in to XenServer.
  2. To modify the virtual machine disk size
    Modify the storage disk size
  3. Start a virtual machine
  4. Modify Partition size
    Fdisk/dev/xvda

    The number of cylinders for this disk was set to 5221.
    There is nothing wrong with the, but this is larger than 1024,
    And could in certain setups cause problems with:
    1) software that runs at boot time (e.g., old versions of LILO)
    2) booting and partitioning software from the other OSs
    (e.g., DOS fdisk, OS/2 fdisk)

    Command (M for help):P

    disk/dev/xvda:42.9 GB, 42949672960 bytes
    255 heads, Sectors/track, 5221 cylinders
    Units = Cylinders of 16065 * 8225280 bytes

    Device Boot Start End Blocks Id System
    /DEV/XVDA1 * 1 104391 Linux
    /dev/xvda2 2610 20860402+ 8e Linux LVM

    Command (M for help): command (M-help):P
    DOS compatibility flag is not set

    Command (M for help):D
    Partition Number (1-4): 2

    Command (M for help):N
    Command Action
    E Extended
    P primary partition (1-4)
    P
    Partition Number (1-4): 2
    First cylinder (14-5221, default 14):
    Using Default Value 14
    Last cylinder or +size or +sizem or +sizek (14-5221, default 5221):
    Using Default Value 5221

    Command (m for help): T
    Partition number (1-4):2
    Hex code (type L to list codes):8e
    Changed system type of partition 2 to 8e (Linux LVM)

    Command (M for help):P

    disk/dev/xvda:42.9 GB, 42949672960 bytes
    255 heads, Sectors/track, 5221 cylinders
    Units = Cylinders of 16065 * 8225280 bytes

    Device Boot Start End Blocks Id System
    /DEV/XVDA1 * 1 104391 Linux
    /dev/xvda2 5221 41833260 8e Linux LVM

    Command (M for help):W
    The partition table has been altered!

    Calling IOCTL () to re-read partition table.

    Warning:re-reading the partition table failed with error 16:device or resource busy.
    The kernel still uses the old table.
    The new table is used at the next reboot.
    Syncing disks.

  5. Restart virtual machine:reboot
  6. Adjust PV size
    PVs
    PV VG Fmt Attr PSize pfree
    /dev/xvda2 VolGroup00 lvm2 a-19.88g 0


    pvresize-v/dev/xvda2
    Using physical Volume (s) on command line
    Archiving Volume Group "VolGroup00" metadata (seqno 3).
    Resizing physical volume/dev/xvda2 from 636 to 1276 extents.
    Resizing volume "/dev/xvda2" to 83666136 sectors.
    Updating physical Volume "/dev/xvda2"
    Creating Volume group Backup "/etc/lvm/backup/volgroup00" (seqno 4).
    Physical volume "/dev/xvda2" changed
    1 physical Volume (s) resized/0 physical volume (s) not resized

    PVs
    PV VG Fmt Attr PSize pfree
    /dev/xvda2 VolGroup00 lvm2 a-39.88g 20.00G
  7. Adjust the LV size
    Lvs
    LV VG Attr lsize Origin snap% Move Log copy% Convert
    LogVol00 Volgroup00-wi-ao 17.84G
    LogVol01 Volgroup00-wi-ao 2.03G

    Lvextend-l +100%free/dev/volgroup00/logvol00
    Extending logical Volume LogVol00 to 37.84 GB
    Logical Volume LogVol00 successfully resized

    Lvs
    LV VG Attr lsize Origin snap% Move Log copy% Convert
    LogVol00 Volgroup00-wi-ao 37.84G
    LogVol01 Volgroup00-wi-ao 2.03G
  8. Resizing a partition
    df-h
    Filesystem Size used Avail use% mounted on
    /dev/mapper/volgroup00-logvol00
    5.7G 4.5G 950M 83%/
    /DEV/XVDA1 99M 22M 73M 24%/boot
    Tmpfs 2.0G 0 2.0G 0%/dev/shm

    resize2fs/dev/mapper/volgroup00-logvol00
    RESIZE2FS 1.39 (29-may-2006)
    Filesystem at/dev/mapper/volgroup00-logvol00 is mounted on/; On-line resizing required
    Performing an on-line resize of/dev/mapper/volgroup00-logvol00 to 9920512 (4k) blocks.
    The filesystem on/dev/mapper/volgroup00-logvol00 is now 9920512 blocks long.

    df-h
    Filesystem Size used Avail use% mounted on
    /dev/mapper/volgroup00-logvol00
    37G 4.5G 31G 13%/
    /DEV/XVDA1 99M 22M 73M 24%/boot
    Tmpfs 2.0G 0 2.0G 0%/dev/shm
    Task complete
  9. Problems encountered
    When the Linux system is CENTOS7, an error is encountered with the RESIZE2FS command Resize2fs:bad magic number in Super-block and trying to open
    Xfs_growfs/dev/root_vg/root with Xfs_growfs instead of command resize2fs

How to adjust the disk size of Linux virtual machines under XenServer

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