Changes between Initial Version and Version 1 of extend-disk-on-kvm-guest

Timestamp:

Jan 18, 2011, 3:28:26 PM (15 years ago)

Author:

Jamie McClelland

Comment:

--

extend-disk-on-kvm-guest

@@ +1 @@
+= How do I extend the disk space for a KVM guest? =
+
+Our KVM guests are each allocated a single logical volume from the KVM host's volume group (typically named after the host).
+
+The first and easiest step is to login to the host, check available disk space, and then run the lvextend command:
+
+{{{
+0 ken:~# vgs
+  VG      #PV #LV #SN Attr   VSize VFree
+  vg_ken0   1  16   0 wz--n- 1.82t 1.29t
+0 ken:~# lvs | grep mirabal
+  mirabal  vg_ken0 -wi-ao  20.00g                                      
+0 ken:~# lvextend --size 35G vg_ken0/mirabal
+  Extending logical volume mirabal to 35.00 GiB
+  Logical volume mirabal successfully resized
+0 ken:~#
+}}}
+
+Next, you will need to reboot the guest before the change in disk space is recognized by the guest (is there a way around this??).
+
+After rebooting, you can confirm the new size by running:
+
+{{{
+cat /proc/partitions
+}}}
+
+You should see that the base disk (e.g. /dev/sda), although all of the partitions are the same size.
+
+Next, run parted and print the current partition table. It's often easier to manage if you look at units in sectors:
+
+{{{
+parted /dev/sda
+unit s
+p
+}}}
+
+You can optionally create a new partition with the remaining space:
+
+{{{
+mkpart primary STARTSECTOR ENDSECTOR
+}}}
+
+Or, you can delete the last partition, and re-create it with a higher end sector (yes, you can do this without destroying the data on the disk):
+
+{{{
+rm 2
+mkpart primary STARTSECTOR ENDSECTOR
+}}}
+
+When creating new partitions, it's a good idea to ensure that the total size of the sector is divisible by 4096.