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The "Leg" Collapse (Three Failures in One Sub-Array)

Details
Written by: Seattle Data Recovery
Category: RAID 60 (RAID 6+0)
The Mechanism
RAID 60 relies entirely on the survival of its individual RAID 6 groups. Consider a 16-drive RAID 60 array split into two groups:
  • Sub-Array 1 (RAID 6): 8 drives (Can survive any 2 drive failures)
  • Sub-Array 2 (RAID 6): 8 drives (Can survive any 2 drive failures)
The top-level RAID 0 layer stripes data across both sub-arrays to maximize speed.
The Impact on RAID 60
If Sub-Array 1 loses two drives and Sub-Array 2 loses two drives, the overall array remains online and fully functional. However, if any single sub-array suffers three drive failures simultaneously or sequentially before a rebuild completes, that specific RAID 6 leg collapses. Because RAID 0 has no redundancy of its own, losing a single sub-array breaks the entire sequential data stripe, instantly crashing the entire RAID 60 volume.

 

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Critical Notice: Physical Damage & Hardware Policy

Please be advised that ANY damage that is physical or mechanical in nature requires additional parts and labor.
The baseline mechanical recovery rate covers our cleanroom environment entry, laboratory equipment allocation, and initial micro-engineering setup. Because physical failures require sourcing exact matching donor drives from our global component pipeline to swap out broken read/write head assemblies, seized spindles, or damaged electronics, all components, replacement donor hardware, and extended mechanical bench labor will be billed as additional standalone costs following your diagnosis.