For maximum compatibility and redudancy; mirrored vdev

is now always used for boot pool

Signed-off-by: Maurice Zhou <jasper@apvc.uk>

docs/Getting Started/Fedora/Root on ZFS/1-preparation.rst

@@ -117,6 +117,9 @@ Preparation
    `here <https://www.delphix.com/blog/delphix-engineering/zfs-raidz-stripe-width-or-how-i-learned-stop-worrying-and-love-raidz>`__
    and `here <https://docs.google.com/spreadsheets/d/1tf4qx1aMJp8Lo_R6gpT689wTjHv6CGVElrPqTA0w_ZY/>`__.
 
+   For boot pool, which must be readable by GRUB, mirrored vdev should always be used for maximum redundancy.
+   This guide will use mirrored bpool for multi-disk setup.
+
    Refer to `zpoolconcepts <https://openzfs.github.io/openzfs-docs/man/7/zpoolconcepts.7.html>`__
    and `zpool-create <https://openzfs.github.io/openzfs-docs/man/8/zpool-create.8.html>`__
    man pages for details.

docs/Getting Started/Fedora/Root on ZFS/2-system-installation.rst

@@ -43,6 +43,11 @@ System Installation
 
 #. Create boot pool::
 
+
+    disk_num=0; for i in $DISK; do disk_num=$(( $disk_num + 1 )); done
+    if [ $disk_num -gt 1 ]; then INST_VDEV_BPOOL=mirror; fi
+
+
     zpool create \
         -o compatibility=grub2 \
         -o ashift=12 \
@@ -57,7 +62,7 @@ System Installation
         -O mountpoint=/boot \
         -R /mnt \
         bpool_$INST_UUID \
-        $INST_VDEV \
+         $INST_VDEV_BPOOL \
         $(for i in ${DISK}; do
            printf "$i-part2 ";
           done)