Hot spare drives are standby drives that can repair a degraded storage pool by automatically replacing a failed drive. Hot spare drives can be globally assigned to protect any storage pool within your Synology NAS, as long as the storage pool matches the following criteria:
1. The RAID type of the storage pool must be one with data protection (i.e., RAID 1, RAID 5, RAID 6, RAID 10, and RAID F1).
2. The hot spare drive size must be equal to or larger than the size of the smallest drive in the storage pool.
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