crush depth

I did end up buying 6 × 8TB drives.

Specifically:

• 2 × Western Digital Pro Red 8TB
• 2 × Toshiba N300 M/N 8TB
• 2 × Seagate IronWolf NAS 8TB

About a week ago, one of the Toshiba drives started producing I/O errors:

  pool: storage
 state: ONLINE
status: One or more devices are faulted in response to persistent errors.
	Sufficient replicas exist for the pool to continue functioning in a
	degraded state.
action: Replace the faulted device, or use 'zpool clear' to mark the device
	repaired.
  scan: scrub repaired 0B in 00:00:00 with 0 errors on Sat Nov 23 19:31:35 2024
config:

	NAME        STATE     READ WRITE CKSUM
	storage     ONLINE       0     0     0
	  raidz2-0  ONLINE       0     0     0
	    sdf     FAULTED     38    37     0  too many errors
	    sdg     ONLINE       0     0     0
	    sda     ONLINE       0     0     0
	    sdc     ONLINE       0     0     0
	    sdb     ONLINE       0     0     0
	    sdd     ONLINE       0     0     0

Upon attempting to scrub the array, the drive was immediately rejected by the system and no longer appeared in /dev. Putting my ear to the rack, I could hear pretty nasty mechanical scraping and clicking noises.

So... A replacement is on the way. No data loss, obviously, as it's a RAIDZ2 array.