[linux-lvm] Prepend LV

Zdenek Kabelac zkabelac at redhat.com
Mon Sep 3 14:52:10 UTC 2018

Dne 3.9.2018 v 11:04 Oleksandr Panchuk napsal(a):
> Hello, All
> I have not found any documentation about how to prepend LV with some free space
> .
> Possible use case - we have LV with filesystem and data on it. But to migrate 
> this LV to KVM virtual machine we need to craft partition inside this LV with 
> already existing data.
> I know it is possible to create new LV and copy data here, but it could be 
> time consuming for big LVs.
> So, Is there any way to prepend LV with some free space ?


Lvm2 does NOT support prepend ATM - as there was no big need for such operation.

On the other hand - experienced user can  with really low 'math-skill' 
requirements  for a manual  extension on the 'ASCII VG metadata' file in 'vi' 
editor -  the format is quite easy to follow.

I assume there is already some RFE to provide such support - in terms of 
existing limitation that you need to always prepend whole 'extent'  (so i.e. 
with 4MiB  extent size - you need to prepend at least 4MiB)



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