Extending a logical volume in a virtual machine running Red Hat or Cent OS (1006371)
2017-09-29 11:07 abce 阅读(290) 评论(0) 编辑 收藏 举报Purpose
This article provides steps for extending the root partition residing in a logical volume created with Logical Volume Manager (LVM) in a virtual machine running Red Hat/Cent OS.
Resolution
To extend the logical volume:
Note: These steps only apply to EXT3 file systems.
Note: These steps only apply to EXT3 file systems.
Caution: VMware recommends to take a complete backup of the virtual machine prior to making these changes.
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Power off the virtual machine.
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Edit the virtual machine settings and extend the virtual disk size. For more information, see Increasing the size of a virtual disk (1004047).
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Power on the virtual machine.
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Identify the device name, which is by default /dev/sda, and confirm the new size by running the command:
# fdisk -l -
Create a new primary partition:
- Run the command:
# fdisk /dev/sda (depending the results of the step 4) - Press p to print the partition table to identify the number of partitions. By default, there are 2: sda1 and sda2.
- Press n to create a new primary partition.
- Press p for primary.
- Press 3 for the partition number, depending on the output of the partition table print.
- Press Enter two times.
- Press t to change the system's partition ID.
- Press 3 to select the newly creation partition.
- Type 8e to change the Hex Code of the partition for Linux LVM.
- Press w to write the changes to the partition table.
- Run the command:
- Restart the virtual machine.
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Run this command to verify that the changes were saved to the partition table and that the new partition has an 8e type:
# fdisk -l -
Run this command to convert the new partition to a physical volume:
Note: The number for the sda can change depending on system setup. Use the sda number that was created in step 5.
# pvcreate /dev/sda3 -
Run this command to extend the physical volume:
# vgextend VolGroup00 /dev/sda3
Note: To determine which volume group to extend, use the command vgdisplay. -
Run this command to verify how many physical extents are available to the Volume Group:
# vgdisplay VolGroup00 | grep "Free" -
Run the following command to extend the Logical Volume:
# lvextend -L+#G /dev/VolGroup00/LogVol00
Where # is the number of Free space in GB available as per the previous command. Use the full number output from Step 10 including any decimals.
Note: To determine which logical volume to extend, use the command lvdisplay. -
Run the following command to expand the ext3 filesystem online, inside of the Logical Volume:
# ext2online /dev/VolGroup00/LogVol00
Notes:- Use resize2fs instead of ext2online if it is not a Red Hat virtual machine.
- By default, Red Hat and CentOS 7 use the XFS file system you can grow the file system by running the xfs_growfs command.
- Run the following command to verify that the / filesystem has the new space available:
# df -h /
Additional Information
For more information, see The Linux Logical Volume Manager from Redhat.
Note: The preceding link was correct as of January 29, 2014. If you find the link is broken, please provide feedback and a VMware employee will update the link.
Note: If the extended vmdk does not reflect the new size under Linux guest OS, rescan SCSI device using the following command:
echo 1 > /sys/block/$DEVICE/device/rescan where $DEVICE is 'sda'
For example:
echo 1 > /sys/block/sda/device/rescan
Note: If the extended vmdk does not reflect the new size under Linux guest OS, rescan SCSI device using the following command:
echo 1 > /sys/block/$DEVICE/device/rescan where $DEVICE is 'sda'
For example:
echo 1 > /sys/block/sda/device/rescan