Le mer. 14 mars 2012 09:08:46 CET, Peter Kjellström a écrit: > On Tuesday 13 March 2012 13.20.01 m.roth at 5-cent.us wrote: > > Peter Kjellström wrote: > > > On Tuesday 13 March 2012 13.41.53 Philippe Naudin wrote: > > >> Hello, > > >> > > >> I am confused by a warning from mkswap : > > >> > > >> When making a swap on a LVM volume, I see the following warning : > > >> mkswap: /dev/vg_SDB1/swap_test6_64: warning: don't erase bootbits > ... > > <snip> > > Are you making swap from a logical partition, or a swapfile? If the > > former, perhaps recreating the partition might help. > > Don't confuse the poor guy. 1) yes he's doing mkswap on an lv which was > obvious had you read the post 2) an lv does not have a partition table so your > statement about recreating it makes no sense. Thanks all for your answers. Actually, my problem concern lvm, not mkswap. I don't know yet if I have completely messed with vgcreate/lvcreate or if what I get is due to some difference between CentOS-5 and CentOS-6, but all my logical volumes seem to appear as distinct disks. On a CentOS-6 machine : $ lvcreate -L 10M --name try_lvcreate --zero=y VolGroup Rounding up size to full physical extent 12.00 MiB Logical volume "try_lvcreate" created $ fdisk -l <snip the "normal" partitions table for /dev/sda> Disk /dev/mapper/VolGroup-try_lvcreate: 12 MB, 12582912 bytes 255 heads, 63 sectors/track, 1 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/VolGroup-try_lvcreate doesn't contain a valid partition table $ mkswap /dev/mapper/VolGroup-try_lvcreate mkswap: /dev/mapper/VolGroup-try_lvcreate: warning: don't erase bootbits sectors on whole disk. Use -f to force. Setting up swapspace version 1, size = 12284 KiB no label, UUID=be229ca5-bcb9-4116-87fc-8878abb44742 The same commands on a CentOS-5 machine give me a completely different output. Can you guess where I have messed, or is this behavior correct on CentOS-6 ? Thanks, -- Philippe Naudin