This happened while removing my junk data aka temp folder via SCP… system crashes anytime it tries to mount the array, wont even boot up the web ui… ~120ish TB of dead pool… gunna try to read only mount and copy whatever is saveable to a secondary array, thank god nobody has bought all the harddrives yet… bout to go spend a couple paychecks on drives & see how this goes… (i have cloud backups but the cost to pull the whole 120tb back just for my homelab would be insane!!!) Im hoping to only find a few dead files so i can backup everything and only have 2 pay to pull back whatever ends up corrupled… wish me luck!!!
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Damn, I feel for you 
Some cloud providers peer with each other for free, so it may be worth copying it all to a provider with 0 or low egress rates if that’s an option.
Recovery is underway!! Mounted the zfs pool read only with a debian live disc and am currently backing up the array so i can wipe it & reload it… so far i have seen zero data loss or corruption so im very optimistic…