Re: [Xen-users] LVM and resize2fs

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Jonathan Tripathy wrote:

> No I can't be sure. That's what I was worried about. Do you think 
> it's an issue? I guess I could not specify the size, however when I 
> want to shrink a disk for a customer, then this becomes a bit 
> trickier, as I have to resize2fs first and then lvresize. What would 
> I do in this case?
What I do is resize the filesystem to slightly smaller than I want, 
resize the volume, and then resize the filesystem to match.
But I have another question about this. I know almost nothing about 
the internals of ext2/3 filesystems - if you create a small one and 
grow it, does that in any way affect any options or optimisations ? I 
know in days of old, there were issues where the allocation chunk 
size was directly related to filesystem size - but I also know that 
ext2/3 is somewhat more intelligent than that.
Also, if you use dd to create your cloned filesystem, does that 
result in any duplicate identifiers ? Or are things like UUIDs create 
at partitioning time ?

An alternative approach would be to create the filesystem the size 
you want it (ie create the volume, create a new filesystem on it), 
and then use something like rsync (or just a recursive option to cp) 
to copy the contents of the base filesystem into it.
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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