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grub2-mkconfig -o /etc/grub.conf

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[root@serveur ~]# df -h /home
Sys. fich.           Taille Util. Dispo Uti% Monté sur
/dev/mapper/lx-home   2,0G   68M  1,9G   4% /home

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[root@serveur ~]# umount /home
[root@serveur ~]# e2fsck -f /dev/mapper/lx-home
e2fsck 1.42.5 (29-Jul-2012)
Passe 1 : vérification des i-noeuds, des blocs et des tailles
Passe 2 : vérification de la structure des répertoires
Passe 3 : vérification de la connectivité des répertoires
Passe 4 : vérification des compteurs de référence
Passe 5 : vérification de l'information du sommaire de groupe
/dev/mapper/lx-home : 11/131072 fichiers (0.0% non contigüs), 25405/524288 blocs
[root@serveur ~]# resize2fs /dev/mapper/lx-home 900M
resize2fs 1.42.5 (29-Jul-2012)
En train de redimensionner le système de fichiers sur /dev/mapper/lx-home à  230400 (4k) blocs.
Le système de fichiers /dev/mapper/lx-home a maintenant une taille de 230400 blocs.

[root@serveur ~]# lvreduce --size=1G /dev/mapper/lx-home
  WARNING: Reducing active logical volume to 1,00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce home? [y/n]: y
  Reducing logical volume home to 1,00 GiB
  Logical volume home successfully resized
[root@serveur ~]# resize2fs /dev/mapper/lx-home
resize2fs 1.42.5 (29-Jul-2012)
En train de redimensionner le système de fichiers sur /dev/mapper/lx-home à  262144 (4k) blocs.
Le système de fichiers /dev/mapper/lx-home a maintenant une taille de 262144 blocs.

[root@serveur ~]# mount /home
[root@serveur ~]# df -h /tmp/home
Sys. fich.           Taille Util. Dispo Uti% Monté sur
/dev/mapper/lx-home   1008M   67M  891M   7% /tmp/home

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grub2-mkconfig -o /boot/grub2/grub.cfg

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[root@silence tmp]# cat etc/fstab 
# 
# /etc/fstab: static file system information
#
# <file system>	<dir>	<type>	<options>	<dump>	<pass>
tmpfs		/tmp	tmpfs	nodev,nosuid	0	0
# /dev/sda10 LABEL=Root
UUID=23c89526-8d73-4b49-94af-966556fd9b73	/         	ext4      	rw,relatime,data=ordered	0 1

# /dev/sda11 LABEL=Home
UUID=aac0fa80-e0e9-414a-9d2c-003e228595cf	/home     	ext4      	rw,relatime,data=ordered	0 2

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menuentry "Arch Linux" {
    search --by-uuid UUID=23c89526-8d73-4b49-94af-966556fd9b73 --set root
    linux /boot/vmlinuz-linux root=/dev/disk/by-label/23c89526-8d73-4b49-94af-966556fd9b73 ro
    initrd /boot/initramfs-linux.img
}

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[root@silence ~]# grub
grub2-bios-setup       grub2-mklayout         grub2-script-check
grub2-editenv          grub2-mknetdir         grub2-set-default
grub2-fstest           grub2-mkpasswd-pbkdf2  grub2-sparc64-setup
grub2-install          grub2-mkrelpath        grubby
grub2-kbdcomp          grub2-mkrescue         grub-crypt
grub2-menulst2cfg      grub2-mkstandalone     grub-md5-crypt
grub2-mkconfig         grub2-ofpathname       grub-terminfo
grub2-mkfont           grub2-probe            
grub2-mkimage          grub2-reboot

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[root@silence ~]# cat /etc/grub.conf 
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file.
# NOTICE:  You have a /boot partition. This means that all kernel and
#          initrd paths are relative to /boot, eg.
#          root (hd0,3)
#          kernel /vmlinuz-version ro root=/dev/sda6
#          initrd /initrd-[generic-]version.img
boot=/dev/sda4
device (hd0,5) HD(4,1579c800,64000,dfb843b9-66b5-4290-bbf4-c464ed5276f4)
default=0
timeout=5
splashimage=(hd0,5)/grub/splash.xpm.gz
hiddenmenu
title Fedora (3.5.4-1.fc17.x86_64)
	root (hd0,5)
	kernel /vmlinuz-3.5.4-1.fc17.x86_64 rd.md=0 rd.lvm=0 rd.dm=0 root=UUID=cd7307bb-9d04-46cc-846f-7a2fc41e1e2f SYSFONT=True rd.luks=0 LANG=en_US.UTF-8 ro  KEYTABLE=fr-pc rhgb quiet
	initrd /initramfs-3.5.4-1.fc17.x86_64.img

title Fedora (3.3.4-5.fc17.x86_64)
	root (hd0,5)
	kernel /vmlinuz-3.3.4-5.fc17.x86_64 rd.md=0 rd.lvm=0 rd.dm=0 root=UUID=cd7307bb-9d04-46cc-846f-7a2fc41e1e2f SYSFONT=True rd.luks=0 LANG=en_US.UTF-8 ro  KEYTABLE=fr-pc rhgb quiet
	initrd /initramfs-3.3.4-5.fc17.x86_64.img

title Archlinux
	root (hd0,9)
	kernel /vmlinuz-linux root=/dev/sda10 ro
	initrd /initramfs-linux.img

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[root@silence ~]# cat /boot/grub2/grub.cfg 
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="${saved_entry}"

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod ext2
set root='hd0,gpt7'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt7 --hint-efi=hd0,gpt7 --hint-baremetal=ahci0,gpt7  cd7307bb-9d04-46cc-846f-7a2fc41e1e2f
else
  search --no-floppy --fs-uuid --set=root cd7307bb-9d04-46cc-846f-7a2fc41e1e2f
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Fedora' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-cd7307bb-9d04-46cc-846f-7a2fc41e1e2f' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_gpt
	insmod ext2
	set root='hd0,gpt6'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt6 --hint-efi=hd0,gpt6 --hint-baremetal=ahci0,gpt6  754bc876-6c5c-4ee6-a967-06737fff6ccd
	else
	  search --no-floppy --fs-uuid --set=root 754bc876-6c5c-4ee6-a967-06737fff6ccd
	fi
	echo	'Loading Linux 3.5.4-1.fc17.x86_64 ...'
	linux	/vmlinuz-3.5.4-1.fc17.x86_64 root=UUID=cd7307bb-9d04-46cc-846f-7a2fc41e1e2f ro quiet rhgb 
	echo	'Loading initial ramdisk ...'
	initrd	/initramfs-3.5.4-1.fc17.x86_64.img
}
submenu 'Advanced options for Fedora' $menuentry_id_option 'gnulinux-advanced-cd7307bb-9d04-46cc-846f-7a2fc41e1e2f' {
	menuentry 'Fedora, with Linux 3.5.4-1.fc17.x86_64' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.5.4-1.fc17.x86_64-advanced-cd7307bb-9d04-46cc-846f-7a2fc41e1e2f' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt6'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt6 --hint-efi=hd0,gpt6 --hint-baremetal=ahci0,gpt6  754bc876-6c5c-4ee6-a967-06737fff6ccd
		else
		  search --no-floppy --fs-uuid --set=root 754bc876-6c5c-4ee6-a967-06737fff6ccd
		fi
		echo	'Loading Linux 3.5.4-1.fc17.x86_64 ...'
		linux	/vmlinuz-3.5.4-1.fc17.x86_64 root=UUID=cd7307bb-9d04-46cc-846f-7a2fc41e1e2f ro quiet rhgb 
		echo	'Loading initial ramdisk ...'
		initrd	/initramfs-3.5.4-1.fc17.x86_64.img
	}
	menuentry 'Fedora, with Linux 3.3.4-5.fc17.x86_64' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.3.4-5.fc17.x86_64-advanced-cd7307bb-9d04-46cc-846f-7a2fc41e1e2f' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt6'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt6 --hint-efi=hd0,gpt6 --hint-baremetal=ahci0,gpt6  754bc876-6c5c-4ee6-a967-06737fff6ccd
		else
		  search --no-floppy --fs-uuid --set=root 754bc876-6c5c-4ee6-a967-06737fff6ccd
		fi
		echo	'Loading Linux 3.3.4-5.fc17.x86_64 ...'
		linux	/vmlinuz-3.3.4-5.fc17.x86_64 root=UUID=cd7307bb-9d04-46cc-846f-7a2fc41e1e2f ro quiet rhgb 
		echo	'Loading initial ramdisk ...'
		initrd	/initramfs-3.3.4-5.fc17.x86_64.img
	}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Arch' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-23c89526-8d73-4b49-94af-966556fd9b73' {
	insmod part_gpt
	insmod ext2
	set root='hd0,gpt10'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt10 --hint-efi=hd0,gpt10 --hint-baremetal=ahci0,gpt10  23c89526-8d73-4b49-94af-966556fd9b73
	else
	  search --no-floppy --fs-uuid --set=root 23c89526-8d73-4b49-94af-966556fd9b73
	fi
	linux /boot/vmlinuz-linux root=/dev/sda10
	initrd /boot/initramfs-linux.img
}
submenu 'Advanced options for Arch' $menuentry_id_option 'osprober-gnulinux-advanced-23c89526-8d73-4b49-94af-966556fd9b73' {
	menuentry 'Arch (on /dev/sda10)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-linux--23c89526-8d73-4b49-94af-966556fd9b73' {
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt10'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt10 --hint-efi=hd0,gpt10 --hint-baremetal=ahci0,gpt10  23c89526-8d73-4b49-94af-966556fd9b73
		else
		  search --no-floppy --fs-uuid --set=root 23c89526-8d73-4b49-94af-966556fd9b73
		fi
		linux /boot/vmlinuz-linux root=/dev/sda10
		initrd /boot/initramfs-linux.img
	}
}

menuentry 'Windows 7 (loader) (on /dev/sda3)' --class windows --class os $menuentry_id_option 'osprober-chain-66804130804107CF' {
	insmod part_gpt
	insmod ntfs
	set root='hd0,gpt3'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt3 --hint-efi=hd0,gpt3 --hint-baremetal=ahci0,gpt3  66804130804107CF
	else
	  search --no-floppy --fs-uuid --set=root 66804130804107CF
	fi
	chainloader +1
}
menuentry 'Windows Recovery Environment (loader) (on /dev/sda5)' --class windows --class os $menuentry_id_option 'osprober-chain-AC7A43BA7A438056' {
	insmod part_gpt
	insmod ntfs
	set root='hd0,gpt5'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5  AC7A43BA7A438056
	else
	  search --no-floppy --fs-uuid --set=root AC7A43BA7A438056
	fi
	drivemap -s (hd0) ${root}
	chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
menuentry "Arch Linux" {
    search --by-uuid UUID=23c89526-8d73-4b49-94af-966556fd9b73 --set root
    linux /boot/vmlinuz-linux root=/dev/disk/by-label/23c89526-8d73-4b49-94af-966556fd9b73 ro
    initrd /boot/initramfs-linux.img
}
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

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[root@silence ~]# ls -la /etc/grub*
lrwxrwxrwx. 1 root root   22 Sep 27 09:37 /etc/grub2.cfg -> ../boot/grub2/grub.cfg
lrwxrwxrwx. 1 root root   32 Sep 25 23:35 /etc/grub.conf -> ../boot/efi/EFI/redhat/grub.conf

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grub2-mkconfig -o /boot/grub2/grub.cfg