Where is /boot mounted on Linux with GPT partitioning?

Question

linux

I'm trying to build software raid1 using mdadm on Linux with GPT. Previously, this was done with a bang when using the MBR.
Disk layout:

parted -s /dev/sda print
Model: ATA ST1000NC001-1DY1 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  1049kB  1031kB                     bios_grub
 2      1049kB  134MB   133MB   fat32              boot, esp
 3      134MB   1000GB  1000GB                     lvm

parted -s /dev/sdb print
Model: ATA ST1000NC001-1DY1 (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  1049kB  1031kB                     bios_grub
 2      1049kB  134MB   133MB                      raid
 3      134MB   1000GB  1000GB                     raid

And now a plug in the /etc/fstab file:

cat /etc/fstab
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/pve/root / ext4 errors=remount-ro 0 1
/dev/pve/data /var/lib/vz ext4 defaults 0 1
/dev/pve/swap none swap sw 0 0
proc /proc proc defaults 0 0

those. There is no separate default partition for boot. Also what, all root to transfer in the first array?

Answer 1

Nowhere, the ESP partition is mounted in /boot/efi.
Here is my simplified configuration:

env LANG=C sudo parted -s /dev/sdb print
Model: ATA KINGSTON SMS200S (scsi)
Disk /dev/sdb: 120GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End    Size   File system  Name  Flags
 1      1049kB  525MB  524MB  fat32              boot, esp
 2      525MB   120GB  120GB  btrfs

cat /etc/fstab
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc                                      /proc     proc  nodev,noexec,nosuid                            0 0
tmpfs                                     /tmp      tmpfs defaults                                       0 0
UUID=5170aca4-061a-4c6c-ab00-bd7fc8ae6030 /         btrfs compress=lzo,noatime,relatime,ssd,subvol=/root 0 1
UUID=8EE3-7796                            /boot/efi vfat  defaults,discard                               0 0

Answer 2

A separate partition for boot was needed only because it was not possible to put a driver into the bootloader of the first stage for each fs. But you have a bios_grub section on your gpt partition. Its minimum size (if my memory serves me right) is 32 kilobytes. There already grub can write half of its modules and drivers for all supported fs, for raid, etc. So there is no need for a separate boot partition.

Answer 3

Anywhere.
I don't have a separate /boot on one machine. On the other - a separate section (the rest under LVM). Everywhere GPT.