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Replaced 1 of 2 Cache Pool Drives, Now Plex Won't Start?

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Jun 12 20:23:17 Tower  emhttpd: shcmd (41): /sbin/btrfs device delete missing /mnt/cache &
Jun 12 20:23:17 Tower kernel: BTRFS info (device sdd1): relocating block group 727079452672 flags data|raid1
Jun 12 20:23:17 Tower kernel: BTRFS info (device sdd1): found 1 extents, stage: move data extents
Jun 12 20:23:17 Tower kernel: BTRFS error (device sdd1): bad tree block start, want 472808472576 have 0
Jun 12 20:23:17 Tower kernel: BTRFS: error (device sdd1: state A) in btrfs_run_delayed_refs:2157: errno=-5 IO failure

Cache fs is corrupt and because of that failing to delete the missing device, there's also a lot of corruption in one of the devices, likely from dropping offline in the past:

Jun 12 20:23:17 Tower kernel: BTRFS info (device sdd1): bdev /dev/sdd1 errs: wr 96501105, rd 32888, flush 3895835, corrupt 3372324, gen 0

For the current pool state best way forward IMHO is to backup what you can and re-create the pool.

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