Applicable Products
Overview
You can mix hard drives (HDDs) of different brands, models, capacities, and speeds in a QNAP NAS, including within the same RAID group. However, this is generally not recommended due to significant trade-offs in performance, capacity, and reliability. For best results, use identical drives (same brand, model, capacity, and rotation speed) within each RAID group.
Details
- Different brands/models: ✓ Allowed. Mixing is supported, but differences in firmware, cache, and vibration handling can lead to unpredictable performance and stability.
- Different capacities: ✓ Allowed. The RAID group’s usable capacity is limited by the smallest disk:
- RAID 1: Capacity = size of the smaller disk
- RAID 5: Capacity = (smallest disk size) × (N − 1)
- RAID 6: Capacity = (smallest disk size) × (N − 2)
- QuTS hero (ZFS): Mirror/RAIDZ vdev size is set by the smallest disk
- Different RPM (e.g., 5400 vs 7200): ⚠ Allowed. The RAID group will perform at the speed of the slowest disk. Differences in heat and noise may also occur.
- Mixing old and new drives: ⚠ Allowed, but older drives are more likely to fail or cause errors during rebuilds.
Limitations
- Capacity waste: Larger disks are limited to the smallest disk’s size in the RAID group.
- Uneven performance: Differences in cache, density, and RPM can cause inconsistent throughput and latency.
- Longer, riskier rebuilds: Mixed drives can prolong rebuild times and increase the risk of errors.
- Thermal/vibration mismatches: Can cause intermittent slowdowns or thermal throttling.
Best Practice
- Use identical drives (brand, model, capacity, RPM) within each RAID group for optimal performance and reliability.
- If you must mix drives, consider creating separate RAID groups for each drive type or capacity, then combine them in a storage pool.
- Always check the QNAP compatibility list for your NAS model before purchasing drives.
- Run long S.M.A.R.T. tests before deploying drives in production.
- Enable RAID scrubbing (QTS) or ZFS scrub (QuTS hero) and monitor drive health regularly.
- Back up your data before making changes to RAID configurations.
When mixing is reasonable
- Emergency replacement: Temporarily use a different drive to restore redundancy, then standardize as soon as possible.
- Non-critical or test environments: Accept capacity loss and variable performance for lab or experimental setups.
- Separate RAID groups: Use larger new drives to create a new RAID group or pool, avoiding limitations from smaller legacy disks.
Further Reading
适用产品
概述
在 QNAP NAS 中，您可以混合使用不同品牌、型号、容量和速度的硬盘（HDD），包括在同一 RAID 组内。然而，由于性能、容量和可靠性方面的折衷，通常不建议这样做。为了获得更好的效果，请在每个 RAID 组内使用相同的硬盘（相同品牌、型号、容量和转速）。
详细信息
- 不同品牌 / 型号： ✓ 允许。支持混合使用，但固件、缓存和振动处理的差异可能导致性能和稳定性不可预测。
- 不同容量： ✓ 允许。RAID 组的可用容量受限于较小磁盘：
- RAID 1：容量 = 较小磁盘的大小
- RAID 5：容量 = （较小磁盘大小）×（N − 1）
- RAID 6：容量 = （较小磁盘大小）×（N − 2）
- QuTS hero（ZFS）：镜像 /RAIDZ vdev 大小由较小磁盘决定
- 不同转速（例如，5400 vs 7200）： ⚠ 允许。RAID 组的性能将以较慢磁盘的速度运行。可能还会出现热量和噪音的差异。
- 混合使用旧硬盘和新硬盘： ⚠ 允许，但旧硬盘在重建过程中更容易出现故障或错误。
限制
- 容量浪费： 较大的磁盘在 RAID 组中受限于较小磁盘的大小。
- 性能不均： 缓存、密度和转速的差异可能导致吞吐量和延迟不一致。
- 重建时间更长，风险更高： 混合硬盘可能会延长重建时间并增加错误风险。
- 热量 / 振动不匹配： 可能导致间歇性减速或热量限制。
较佳实践
- 在每个 RAID 组中使用相同的硬盘（品牌、型号、容量、转速）以获得良好的性能和可靠性。
- 如果必须混用硬盘，考虑为每种硬盘类型或容量创建单独的 RAID 组，然后在存储池中组合它们。
- 在购买硬盘之前，请始终检查您的 NAS 型号的QNAP 兼容性列表。
- 在将硬盘投入生产前运行长时间的 S.M.A.R.T. 测试。
- 启用 RAID 擦除（QTS）或 ZFS 擦除（QuTS hero），并定期监控硬盘健康状况。
- 在更改 RAID 配置之前备份您的数据。
当混用是合理的
- 紧急替换： 临时使用不同的硬盘来恢复冗余，然后尽快标准化。
- 非关键或测试环境： 接受容量损失和性能变化用于实验室或实验设置。
- 独立的 RAID 组： 使用更大的新硬盘创建新的 RAID 组或池，避免受到较小旧硬盘的限制。
进一步阅读
