我需要了解如何让 grub2/opensuse 启动过程忽略非主磁盘上的 raid 分区。我的系统有 /dev/sda 和 /dev/sdb，它们是从 grub2 启动 UEFI 的主磁盘和一系列辅助磁盘。它们看起来像这样：
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 2G 0 part /boot/efi
└─sda2 8:2 0 463.8G 0 part
└─md0 9:0 0 463.8G 0 raid1
├─system-root 254:0 0 455.8G 0 lvm /
└─system-swap 254:1 0 8G 0 lvm [SWAP]
sdb 8:16 0 465.8G 0 disk
├─sdb1 8:17 0 2G 0 part
└─sdb2 8:18 0 463.8G 0 part
└─md0 9:0 0 463.8G 0 raid1
├─system-root 254:0 0 455.8G 0 lvm /
└─system-swap 254:1 0 8G 0 lvm [SWAP]
sdc 8:32 0 1.8T 0 disk
├─sdc1 8:33 0 399M 0 part
└─sdc2 8:34 0 1.8T 0 part
sdd 8:48 0 1.8T 0 disk
├─sdd1 8:49 0 399M 0 part
└─sdd2 8:50 0 1.8T 0 part
sde 8:64 0 1.8T 0 disk
sdf 8:80 0 1.8T 0 disk
磁盘 /dev/sdc - /dev/sdf 是外部主机上运行的虚拟主机使用的磁盘。原因是外部主机充当路由器，而内部主机是加密的根服务器，可以通过 ssh 进入外部主机远程启动。外部主机没有根加密，但显然不托管任何关键数据。
问题在于磁盘 /dev/sdc - /dev/sdf 有 raid 分区（加密 + lvm 等），当外部系统启动时，它会尝试构建 raid 阵列、解密等。必须先解构这些 raid 阵列，然后才能启动虚拟主机。此外，当这些 raid 阵列上的卷无法解密时，启动会失败。
问题：如何设置 grub2 启动过程以忽略磁盘 /dev/sdc - /dev/sdf 上的分区并仅基于主磁盘 /dev/sda 和 /dev/sdb 设置系统。目标是自动启动，结构如上。
这是 /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 [ -f ${config_directory}/grubenv ]; then
load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${env_block}" ] ; then
load_env -f "${env_block}"
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
if [ "${env_block}" ] ; then
save_env -f "${env_block}" next_entry
fi
set boot_once=true
else
set default="${saved_entry}"
fi
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$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod part_gpt
insmod diskfilter
insmod mdraid1x
insmod lvm
insmod ext2
set root='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz' 95092080-6e02-43c0-8e97-730fd53cb61f
else
search --no-floppy --fs-uuid --set=root 95092080-6e02-43c0-8e97-730fd53cb61f
fi
font="/usr/share/grub2/unicode.pf2"
fi
if loadfont $font ; then
echo "Please press t to show the boot menu on this console"
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=POSIX
insmod gettext
fi
terminal_output gfxterm
insmod part_gpt
insmod part_gpt
insmod diskfilter
insmod mdraid1x
insmod lvm
insmod ext2
set root='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz' 95092080-6e02-43c0-8e97-730fd53cb61f
else
search --no-floppy --fs-uuid --set=root 95092080-6e02-43c0-8e97-730fd53cb61f
fi
insmod gfxmenu
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans-Bold14.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans10.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans12.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/ascii.pf2
insmod png
set theme=($root)/boot/grub2/themes/openSUSE/theme.txt
export theme
if [ x${boot_once} = xtrue ]; then
set timeout=0
elif [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=8
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=8
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/00_tuned ###
set tuned_params=""
### END /etc/grub.d/00_tuned ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'openSUSE LEAP 42.2' --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-95092080-6e02-43c0-8e97-730fd53cb61f' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod part_gpt
insmod diskfilter
insmod mdraid1x
insmod lvm
insmod ext2
set root='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz' 95092080-6e02-43c0-8e97-730fd53cb61f
else
search --no-floppy --fs-uuid --set=root 95092080-6e02-43c0-8e97-730fd53cb61f
fi
echo 'Loading Linux 4.4.27-2-default ...'
linux /boot/vmlinuz-4.4.27-2-default root=/dev/mapper/system-root resume=/dev/system/swap splash=silent quiet showopts nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd-4.4.27-2-default
}
submenu 'Advanced options for openSUSE LEAP 42.2' --hotkey=1 $menuentry_id_option 'gnulinux-advanced-95092080-6e02-43c0-8e97-730fd53cb61f' {
menuentry 'openSUSE LEAP 42.2, with Linux 4.4.27-2-default' --hotkey=2 --class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.27-2-default-advanced-95092080-6e02-43c0-8e97-730fd53cb61f' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod part_gpt
insmod diskfilter
insmod mdraid1x
insmod lvm
insmod ext2
set root='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='lvmid/36Ndwy-2YD2-onbC-3fKp-BdXl-Kmra-aELGxs/Pt4neo-JhAd-I4G4-02S8-X8eb-5xeY-wRpDWz' 95092080-6e02-43c0-8e97-730fd53cb61f
else
search --no-floppy --fs-uuid --set=root 95092080-6e02-43c0-8e97-730fd53cb61f
fi
echo 'Loading Linux 4.4.27-2-default ...'
linux /boot/vmlinuz-4.4.27-2-default root=/dev/mapper/system-root resume=/dev/system/swap splash=silent quiet showopts nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd-4.4.27-2-default
}
}
### 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_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###
### 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/50_bootcycle ###
# created for bootcycle detection
menuentry 'halt' {
halt
}
### END /etc/grub.d/50_bootcycle ###
### BEGIN /etc/grub.d/80_suse_btrfs_snapshot ###
### END /etc/grub.d/80_suse_btrfs_snapshot ###
### BEGIN /etc/grub.d/90_persistent ###
### END /etc/grub.d/90_persistent ###
### BEGIN /etc/grub.d/95_textmode ###
# On EFI systems we can only have graphics *or* serial, so allow the user
# to switch between the two
hiddenentry 'Text mode' --hotkey 't' {
set textmode=true
terminal_output console
}
### END /etc/grub.d/95_textmode ###
请告诉我还有哪些其他信息可能有助于理解。
答案1
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
这只是部分正确：你不应该修改它的原因只是因为它会被覆盖grub2-mkconfig。没有其他理由不手动创建它。你可以减少/boot/grub2/grub.cfg到只包含你需要的菜单项编写自己的配置文件。
grub-mkconfig/etc/grub.d/40_custom确实有一些限制。虽然可以通过编辑或创建将额外的自定义菜单项添加到列表末尾/boot/grub/custom.cfg，但更改菜单项的顺序或更改其标题可能需要对存储在中的 shell 脚本进行复杂的更改/etc/grub.d/。这可能会在未来得到改进。与此同时，grub.cfg鼓励那些认为直接编写更容易的人这样做（请参阅 启动， 和类似 Shell 的脚本) 并禁止其发行版提供的任何系统自动运行grub-mkconfig。
创建的配置grub-mkconfig试图包含任何地方可检测到的所有内容，例如安装的每个内核等。但是，您的配置似乎更复杂，可能需要相对复杂的手动创建grub.cfg。