Unverified90% confidenceFactExact time
RAID 5 at full 4-bay capacity with 6TB drives can provide approximately 18TB of usable space (4×6TB minus one drive's parity)
1
Sources
90%
Confidence
Long-term
Relevance
8/1/2026
First Seen
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UnverifiedRAID 5至少需要3块盘，可用容量为(N-1)×单盘容量，容忍1块盘故障；但重建时对剩余盘的持续读取压力极大，8TB以上单盘用RAID 5存在重建期二次掉盘风险，建议改用RAID 683% similarUnverifiedRAID 5至少需要3块硬盘，可容忍1块盘故障，容量利用率为(N-1)/N；RAID 6需要至少4块盘，可容忍2块盘同时故障，适合8盘位以上大容量阵列以规避重建期二次故障风险83% similarUnverifiedRAID5至少需要3块盘、RAID6至少需要4块盘、RAID10需要偶数块且最少4块；单盘容量≥8TB时应优先选RAID6而非RAID5，因大盘重建时间长，重建期间再坏一盘会全阵列崩溃81% similarUnverifiedRAID 5 需要至少3块盘且损失1块盘容量做校验，4盘位是RAID 5的性价比甜点（可用容量75%且能容忍单盘故障）；2盘位设备无法组RAID 5，只能选RAID 0/1/JBOD80% similarUnverified要做RAID5至少需要3块盘，4盘位是RAID5的实用起点（3盘做阵列+扩展空间）；2盘位只能做RAID1，容量利用率仅50%76% similar
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