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proxmox/proxmox-replace-zfs-mirror-boot-disks-with-smaller.sh

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+#!/bin/bash
+
+# Replace zfs boot/root mirror disks with smaller ones and fix boot for both
+# 2024.May kneutron
+
+# NOTE I TAKE NO RESPONSIBILITY FOR DATA LOSS, EDIT THIS SCRIPT BEFORE RUNNING 
+# AND MAKE SURE YOU DESIGNATE THE RIGHT DISKS!
+
+# NOTE it is HIGHLY RECOMMENDED to try this in a vm first!!!!
+
+# REF: https://www.reddit.com/r/Proxmox/comments/1cr6wn7/tutorial_howto_migrate_a_pve_zfs_bootroot_mirror/
+
+set -u # abort on undefined var
+set -e # abort on error
+
+echo "WARNING: About to destructively apply a new GPT label to disks - ^C to backout or Enter to proceed"
+read
+
+# TODO EDITME and make sure to put the correct shortnames in!
+oldisk1=vda
+oldisk2=vdb
+
+newdisk1=vdc
+newdisk2=vdd
+
+for disk in $newdisk1 $newdisk2; do
+ echo $disk
+sgdisk -g \
+-n 1:0:+1M \
+-n 2:0:+1G \
+-n 3:0:0 \
+-t 1:8300 \
+-t 2:EF00 \
+-t 3:BF01 \
+-p /dev/$disk
+
+ gdisk -l /dev/$disk
+done
+
+echo "$(date) - Prep new disks, blank any filesystem / zfs data"
+set +e # OK if we fail here, not fatal
+zpool labelclear /dev/${newdisk1}3
+zpool labelclear /dev/${newdisk2}3
+wipefs -a /dev/${newdisk1}3
+wipefs -a /dev/${newdisk2}3
+set -e
+
+zpool status rpool -v
+echo "About to replace old boot disks with new disks - ^C to backout / Enter = proceed"
+read
+
+set -x
+zpool add -f rpool mirror /dev/${newdisk1}3 /dev/${newdisk2}3
+
+zpool detach rpool /dev/${oldisk1}3
+time zpool remove rpool /dev/${oldisk2}3
+set +x
+
+# wait for resilver
+sdate=$(date)
+# do forever
+while :; do
+  clear
+  echo "Pool: rpool - NOW: $(date) -- Watchresilver started: $sdate"
+
+  zpool status rpool |grep -A 2 'in progress' || break 2
+  zpool iostat -v rpool #2 3 &
+
+  sleep 5
+  date
+done
+
+ndate=$(date)
+
+zpool status -v rpool |awk 'NF>0' # skip blank lines
+echo "o Resilver watch rpool start: $sdate // Completed: $ndate"
+
+proxmox-boot-tool status # Note if grub is being used or not here
+addgrub=""
+[ $(proxmox-boot-tool status |grep -c grub) -gt 0 ] && addgrub="grub"
+
+echo "$(date) - Fixing boot on both new drives"
+set -x
+proxmox-boot-tool format /dev/${newdisk1}2 --force # <new disk's ESP partn>
+proxmox-boot-tool format /dev/${newdisk2}2 --force # <new disk's ESP partn>
+time sync; sleep 2
+
+proxmox-boot-tool init /dev/${newdisk1}2 $addgrub # <new disk's ESP partn>
+proxmox-boot-tool init /dev/${newdisk2}2 $addgrub # <new disk's ESP partn>
+
+proxmox-boot-tool refresh
+set +x
+
+zpool status rpool -v
+
+echo '====='
+echo "You should be able to boot with either disk now! After shutdown + remove old disks, run:"
+echo " proxmox-boot-tool clean"
+echo "and:"
+echo " zpool clear rpool"
+
+exit;
+
+
+Device             Start       End   Sectors  Size Type
+/dev/nvme0n1p1        34      2047      2014 1007K BIOS boot
+/dev/nvme0n1p2      2048   2099199   2097152    1G EFI System
+/dev/nvme0n1p3   2099200 167772160 165672961  119G ZFS
+
+# REFs:
+https://forum.proxmox.com/threads/replace-512gb-ssds-with-500gb-ssds.143077/
+
+https://pve.proxmox.com/wiki/ZFS_on_Linux#sysadmin_zfs_change_failed_dev
+
+https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_proxmox_boot_tool
+
+https://forum.proxmox.com/threads/fixing-uefi-boot.87719/