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Resize a GPT virtual disk

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19 Aug 2016

After the reinstallation of my multimedia server i created a too small vdisk, no problemo i use LVM, simply resize the disk in proxmox, recreate your PV partition and pvresize, that’s it.

Surprise motha*****, you can’t resize your LVM PV partition if you have a GPT partition table because GPT put his backup structure at the end of the disk.

Disk /dev/vdb: 3774873600 sectors, 1.8 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): C720DBB4-0888-42EC-8C26-6A4B67199931
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 2097151966

As you can see the disk is 3774873600 sectors but only (2097151966 - 34) is usable.

We can fix this by entering in the expert mode with “x” and “e” (relocate backup data structures to the end of the disk)

Now we have all our sector usable.

Disk /dev/vdb: 3774873600 sectors, 1.8 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): C720DBB4-0888-42EC-8C26-6A4B67199931
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 3774873566

After that follow the basic steps to resize your LVM PV.


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