Help? One array drive not being written to...


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Looking for some troubleshooting suggestions or advice as to why one of my array drives is not being utilized / written on?

 

Each of the disks on the array was set up in a similar fashion when I first put this together last spring. I went through and precleared all drives, did the suggested health checks, etc. before ramping up the system for regular use. Everything checked out to my knowledge/awareness. 

 

My Disk Settings's default partition format is set to MBR: 4k-aligned, file system is xfs . 

  • 8TB parity drive (GPT: 4k-aligned) 
  • 1TB disk1 (MBR: 4k-aligned) | 35% utilization
  • 8TB disk2 (GPT: 4k-aligned) | 75% utilization
  • 2TB disk3 (MBR: 4k-aligned) | 0% utilization
  • 8TB disk4 (GPT: 4k-aligned) | 57% utilization

 

Every disk has been utilized to some degree -- EXCEPT disk3 -- and I'm stumped. Does anyone have any ideas?

Note: obviously those tiny 1 and 2TB drives will be the first ones replaced with larger 8TBs later... but for the time being, I'm super curious as to why this issue is happening.

 

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