btrfs RAID 6 w/8x3Tb WD Reds (as of 20231211)

btrfs scrubbing ensure rebuild doesn't result in data loss. Weekly might be too frequent?

sudo crontab -l 

0   0    3   *   *   btrfs scrub status /Volumes/Zeus >> /Volumes/Zeus/scrubstatus/status.txt
0   0    1   *   *   btrfs scrub start /Volumes/Zeus >> /Volumes/Zeus/scrubstatus/status.txt

# check the drive status at midnight. output anything that doesnt say online and spun up
0 0 * * * /usr/sbin/megacli -PDList -aALL |grep -i firmware\ state|grep -v ": Online, Spun Up$"

megacli  -PDList -a0|grep status -i

Alarm will sound from rhea in the server room. Solid red light will be on hard drive enclosure that is failing. Can hotswap: pull out bad bay and replace with new hard drive.

Rebuilt status /root/src/check_raid/watch_rebuild.pl or

megacli -PDRbld -ShowProg -PhysDrv[252:5] -a0