NULL(4)                          Linux Programmer's Manual                         NULL(4)

NAME
       null, zero - data sink

DESCRIPTION
       Data written to a null or zero special file is discarded.

       Reads  from  the null special file always return end of file (i.e., read(2) returns
       0), whereas reads from zero always return bytes containing zero (\0 characters).

       null and zero are typically created by:

              mknod -m 666 /dev/null c 1 3
              mknod -m 666 /dev/zero c 1 5
              chown root:root /dev/null /dev/zero

FILES
       /dev/null
       /dev/zero

NOTES
       If these devices are not writable and readable for all users,  many  programs  will
       act strangely.

SEE ALSO
       chown(1), mknod(1), full(4)

# locale -a
C
en_US
en_US.iso88591
en_US.utf8
POSIX
ru_RU
ru_RU.iso88595
ru_RU.koi8r
ru_RU.utf8
russian

# gdisk -l /dev/sdb
GPT fdisk (gdisk) version 0.8.6

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdb: 1953525168 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): DBF226A2-846C-4283-BCB5-6FD01DC64164
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048         1026047   500.0 MiB   8300  Linux filesystem
   2         1026048         1091583   32.0 MiB    EF02  BIOS boot partition
   3         1091584         2115583   500.0 MiB   8300  Linux filesystem
   4         2115584        65030143   30.0 GiB    8300  Linux filesystem
   5        65030144      1953525134   900.5 GiB   0700  Solaris root

# zpool create -f -o ashift=12 -o cachefile= -O compression=on -m none -R /mnt/gentoo rpool /dev/sdb5
# zfs set dedup=off rpool
# zfs set atime=off rpool
# zfs set xattr=off rpool
# zfs set compression=lz4 rpool

# zfs create -o mountpoint=/                      -o compression=off rpool/ROOT
# zfs create -o mountpoint=/usr                   -o compression=off rpool/ROOT/usr
# zfs create -o mountpoint=/usr/portage           -o compression=on  rpool/ROOT/portage
# zfs create -o mountpoint=/usr/portage/distfiles -o compression=off rpool/ROOT/distfiles
# zfs create -o mountpoint=/usr/src               -o compression=on  rpool/ROOT/src
# zfs create -o mountpoint=/var                   -o compression=on  rpool/ROOT/var
# zfs create -o mountpoint=/var/lib/layman        -o compression=on  rpool/ROOT/layman
# zfs create -o mountpoint=/home                  -o compression=on  rpool/HOME

# mount -v /dev/sdb3  /mnt/gentoo/boot

# zpool list
NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
rpool   896G  46,4G   850G     5%  1.00x  ONLINE  /mnt/gentoo
# zpool status
  pool: rpool
 state: ONLINE
  scan: none requested
config:

    NAME        STATE     READ WRITE CKSUM
    rpool       ONLINE       0     0     0
      sdb5      ONLINE       0     0     0

errors: No known data errors
# zfs list
NAME                   USED  AVAIL  REFER  MOUNTPOINT
rpool                 46,4G   836G   136K  none
rpool/HOME            38,4G   836G  38,4G  /mnt/gentoo/home
rpool/ROOT            8,02G   836G  99,8M  /mnt/gentoo
rpool/ROOT/distfiles  2,34G   836G  2,34G  /mnt/gentoo/usr/portage/distfiles
rpool/ROOT/layman      255M   836G   255M  /mnt/gentoo/var/lib/layman
rpool/ROOT/portage     838M   836G   838M  /mnt/gentoo/usr/portage
rpool/ROOT/src         486M   836G   486M  /mnt/gentoo/usr/src
rpool/ROOT/usr        3,80G   836G  3,80G  /mnt/gentoo/usr
rpool/ROOT/var         240M   836G   240M  /mnt/gentoo/var
# zpool export -f rpool
# reboot

GRUB_CMDLINE_LINUX_DEFAULT="dozfs=force"

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

# 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="0"

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$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod zfs
set root='hd1,gpt5'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt5 --hint-efi=hd1,gpt5 --hint-baremetal=ahci1,gpt5  04375699b6712308
else
  search --no-floppy --fs-uuid --set=root 04375699b6712308
fi
    font="/ROOT/usr@//share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=ru_RU
  insmod gettext
fi
terminal_output gfxterm
if sleep --interruptible 0 ; then
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Gentoo GNU/Linux' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-04375699b6712308' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_gpt
    insmod ext2
    set root='hd1,gpt3'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3  42a6dff3-92b9-4971-83fa-73928787f87b
    else
      search --no-floppy --fs-uuid --set=root 42a6dff3-92b9-4971-83fa-73928787f87b
    fi
    echo    'Загружается Linux x86_64-3.9.0-geek …'
    linux    /kernel-genkernel-x86_64-3.9.0-geek root=ZFS=rpool/ROOT ro  dozfs=force
    echo    'Загружается начальный виртуальный диск …'
    initrd    /initramfs-genkernel-x86_64-3.9.0-geek
}
submenu 'Дополнительные параметры для Gentoo GNU/Linux' $menuentry_id_option 'gnulinux-advanced-04375699b6712308' {
    menuentry 'Gentoo GNU/Linux, с Linux x86_64-3.9.0-geek' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-x86_64-3.9.0-geek-advanced-04375699b6712308' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        set root='hd1,gpt3'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3  42a6dff3-92b9-4971-83fa-73928787f87b
        else
          search --no-floppy --fs-uuid --set=root 42a6dff3-92b9-4971-83fa-73928787f87b
        fi
        echo    'Загружается Linux x86_64-3.9.0-geek …'
        linux    /kernel-genkernel-x86_64-3.9.0-geek root=ZFS=rpool/ROOT ro  dozfs=force
        echo    'Загружается начальный виртуальный диск …'
        initrd    /initramfs-genkernel-x86_64-3.9.0-geek
    }
    menuentry 'Gentoo GNU/Linux, с Linux x86_64-3.9.0-geek (режим восстановления)' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-x86_64-3.9.0-geek-recovery-04375699b6712308' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        set root='hd1,gpt3'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3  42a6dff3-92b9-4971-83fa-73928787f87b
        else
          search --no-floppy --fs-uuid --set=root 42a6dff3-92b9-4971-83fa-73928787f87b
        fi
        echo    'Загружается Linux x86_64-3.9.0-geek …'
        linux    /kernel-genkernel-x86_64-3.9.0-geek root=ZFS=rpool/ROOT ro single 
        echo    'Загружается начальный виртуальный диск …'
        initrd    /initramfs-genkernel-x86_64-3.9.0-geek
    }
}

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

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

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

### BEGIN /etc/grub.d/30_os-prober ###
### 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.
### 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 ###

# locale
LANG=ru_RU.UTF-8
LC_CTYPE="ru_RU.UTF-8"
LC_NUMERIC="ru_RU.UTF-8"
LC_TIME="ru_RU.UTF-8"
LC_COLLATE="ru_RU.UTF-8"
LC_MONETARY="ru_RU.UTF-8"
LC_MESSAGES="ru_RU.UTF-8"
LC_PAPER="ru_RU.UTF-8"
LC_NAME="ru_RU.UTF-8"
LC_ADDRESS="ru_RU.UTF-8"
LC_TELEPHONE="ru_RU.UTF-8"
LC_MEASUREMENT="ru_RU.UTF-8"
LC_IDENTIFICATION="ru_RU.UTF-8"
LC_ALL=ru_RU.UTF-8
# cat /etc/env.d/02locale
LC_ALL=" "
LANG="ru_RU.UTF-8"
LC_MESSAGES="ru_RU.UTF-8"