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