[CentOS] mkswap, lvm and bootbits sectors

Peter Kjellström cap at nsc.liu.se
Wed Mar 14 13:14:31 EDT 2012


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).

/Peter
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