harmony/docs/doc-clone-and-restore-coreos.md

Working procedure to clone and restore CoreOS disk from OKD Cluster

Step 1 - take a backup

sudo dd if=/dev/old of=/dev/backup status=progress 

Step 2 - clone beginning of old disk to new

sudo dd if=/dev/old of=/dev/backup status=progress count=1000Mib

Step 3 - verify and modify disk partitions

list disk partitions

sgdisk -p /dev/new

if new disk is smaller than old disk and there is space on the xfs partition of the old disk, modify partitions of new disk

gdisk /dev/new

inside of gdisk commands

-v -> verify table
-p -> print table
-d -> select partition to delete partition
-n -> recreate partition with same partition number as deleted partition

For end sector, either specify the new end or just press Enter for maximum available When asked about partition type, enter the same type code (it will show the old one)

p - >to verify 
w -> to write

make xfs file system for new partition

sudo mkfs.xfs -f /dev/new4

**Step 4 - copy old PARTUUID **

careful here get old patuuid:

sgdisk -i <partition_number> /dev/old_disk  # Note the "Partition unique GUID"

get labels

sgdisk -p /dev/old_disk  # Shows partition names in the table

blkid /dev/old_disk*  # Shows PARTUUIDs and labels for all partitions

set it on new disk

sgdisk -u <partition_number>:<old_partuuid> /dev/sdc

partition name:

sgdisk -c <partition_number>:"<old_name>" /dev/sdc

verify all:

lsblk -o NAME,SIZE,PARTUUID,PARTLABEL /dev/old_disk

Step 5 - Mount disks and copy files from old to new disk

mount files before copy:

mkdir -p /mnt/new
mkdir -p /mnt/old
mount /dev/old4 /mnt/old
mount /dev/new4 /mnt/new

copy:

rsync -aAXHv --numeric-ids /source/ /destination/

Step 6 - Set correct UUID for new partition 4

to set correct uuid for partition 4

blkid /dev/old4

xfs_admin -U <old_uuid> /dev/new_partition

to set labels get it

sgdisk -i 4 /dev/sda | grep "Partition name"

set it

sgdisk -c 4:"<label_name>" /dev/sdc

or

(check existing with xfs_admin -l /dev/old_partition)
Use xfs_admin -L <label> /dev/new_partition 

Step 7 - Verify

verify everything:

sgdisk -p /dev/sda  # Old disk
sgdisk -p /dev/sdc  # New disk

lsblk -o NAME,SIZE,PARTUUID,PARTLABEL /dev/sda
lsblk -o NAME,SIZE,PARTUUID,PARTLABEL /dev/sdc

blkid /dev/sda* | grep UUID=
blkid /dev/sdc* | grep UUID=

Step 8 - Unmount devices and Finalize job

unmount old devices

umount /mnt/new
umount /mnt/old

shutdown swap disk and verify it worked