for some reason… did ext3 on RAID1 with two disks (seagate + wd) of different sized (2TB but they (of course) are not exactly 2TB)
watch out: shingled hdd are not good for RAID!
not sure where the problem here was 1) kernel 2) ext3 3) the disks…
have a sufficient sized external USB harddisk ready to save backup data to
# tested on Debian 10, should work on other distros as well # mount one disk to backup all data from a failed raid1 # (the second wd disk always dropped out of raid) # (not sure was the problem was 1) kernel (older) 2) hardware 3) ext3) # checkout this guide on what hardware is raid-able # what devices are there ## show harddisks and partitions lsblk -fs ## the more fancy harddisk view lsblk -o 'LABEL,NAME,MAJ:MIN,RM,SIZE,RO,FSTYPE,MOUNTPOINT,UUID'; # create mount point mkdir -p /media/user/md1 # start raid1 with one of the two disks # (should have identical content) mdadm --assemble --run /dev/md1 /dev/sde1 # it might also be possible not at all specify the exact partition harddisk to use # but let mdadm do the auto detecting job # was tested and worked perfectly fine mkdir -p /media/user/md0 mkdir -p /media/user/md1 mkdir -p /media/user/md2 mkdir -p /media/user/md3 mdadm --assemble --run /dev/md0 mdadm --assemble --run /dev/md1 mdadm --assemble --run /dev/md2 mdadm --assemble --run /dev/md3 # this is the swap, no need to mount it mount /dev/md0 /media/user/md0 mount: /media/user/md0: unknown filesystem type 'swap'. mount /dev/md1 /media/user/md1 mount /dev/md2 /media/user/md2 mount /dev/md3 /media/user/md3 # checkout what is in the partitions ls -lah /media/user/md1 # aha! kernels! so it is the boot partition ls -lah /media/user/md2 # aha! home! this is the main data and root partition # (if home and root is the same partition) # run the backup rsync -r -vv --update --progress /media/user/md1/ /media/user/mount/point/of/external/usb/harddisk # optional: get more info about the disks hdparm -I /dev/sde|grep Model Model Number: ST2000NM0033-9ZM175 blockdev --report /dev/sde RO RA SSZ BSZ StartSec Size Device rw 256 512 4096 0 2000398934016 /dev/sde hdparm -I /dev/sdf|grep Model Model Number: WDC WD20EARS-00MVWB0 blockdev --report /dev/sdf RO RA SSZ BSZ StartSec Size Device rw 256 512 512 0 2000397852160 /dev/sdf # seagate + wd, will it go together? X-D # after backup complete # make sure disks are umounted # sync write caches sync; sync; sync; # unmount all raid device-partitions umount /dev/md* mdadm --stop /dev/md1 mdadm --remove /dev/md1
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