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CHECK.md

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BTRFS Scrubbing

btrfs will by default checksum your data blocks.
Using the scrub feature, we can validate that there are no problems with any data blocks currently storing data.
If any bad blocks are found under a disk image, you can just recover that image on other good sectors.
To validate a single filesystem, do the following (replacing /mnt/VAHAW81L with your mounted btrfs)

btrfs scrub start /mnt/VAHAW81L
btrfs scrub status /mnt/VAHAW81L

If you have a microraids map file, you can use the provided scrub script to check all your filesystems.
Your btrfs filesystem must be mounted to start scrubbuing, but your microraids do not have to be running.

./mr_scrub.sh <MAP> <start|status>

./mr_scrub.sh mnt_locations.map start
./mr_scrub.sh mnt_locations.map status

For each filesystem, it will give you relevant status.

Scrub started:    Tue Apr 14 12:53:58 2020
Status:           finished
Duration:         0:00:00
Total to scrub:   512.00KiB
Rate:             170.67KiB/s
Error summary:    no errors found

BTRFS Offline Data Check

Another way to check your data blocks is to use the btrfs check utility on an unmounted partition.
This expects that the filesystem is otherwise OK, and is basically an offline scrub but does not repair data from spare copies.

btrfs check --check-data-csum /dev/sdX1

RAID Checking

Another way to check your microraid is to ask the kernel to run an integrity check for you.
For each running microraid, this command can be given to each individually.

./mr_check.sh /dev/md/mynewraid

/proc/mdstat will show you the check status.

cat /proc/mdstat 
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] 
md127 : active raid6 loop19[1] loop18[6] loop17[5] loop16[4] loop15[7] loop14[3] loop13[2] loop12[0]
      239797248 blocks super 1.2 level 6, 256k chunk, algorithm 2 [8/8] [UUUUUUUU]
      [====>................]  check = 23.3% (9324500/39966208) finish=8.8min speed=57308K/sec