[CentOS] mkswap, lvm and bootbits sectors

Thu Mar 15 08:32:25 UTC 2012
Philippe Naudin <philippe.naudin at supagro.inra.fr>

Le mer. 14 mars 2012 18:14:31 CET, Peter Kjellström a écrit:

> On Wednesday 14 March 2012 11.50.37 Philippe Naudin wrote:
> > Thanks all for your answers.
> > 
> > Actually, my problem concern lvm, not mkswap.
> No, afaict there's nothing wrong with your lvm. The only problem I see is that 
> mkswap prints our an incorrect or at least pointless warning.
> I can confirm that mkswap on an lv on one of my test machines also says 
> "warning: don't erase bootbits...". It also says this when running against a 
> file full of zeroes...
> Regarding fdisks complaints about "doesn't contain a valid partition 
> table...", this is normal (and may be considered a bug in the "-l" option, it 
> could have excluded lvm-devices from its list...).
> If you want to get to the bottom of this I suspect the easiest way is to look 
> at the mkswap source code (under which circumstances it prints that message).

Ahh, perfect, thanks a lot. These bugs^W features of fdisk and mkswap
were absent of CentOS-5 : I was lost, wondering what can be my

Thanks again,

Philippe Naudin