Hot Spare
Hot spare disks are standby hard disks that can repair a degraded storage pool by automatically replacing a failed disk. Hot spare disks can be globally assigned to protect any storage pool within your DiskStation, as long as the storage pool matches the following criteria:
- The RAID type of the storage pool must be one with data protection (i.e. RAID 1, RAID 5, RAID 6, RAID 10, RAID F1).
- The hot spare disk size must be equal to or larger than the size of the smallest disk in the storage pool.
To set up hot spare disks:
- Click Manage.
- A dialog appears, displaying the hot spare status of each storage pool, as well as available disks. Storage pool status includes the following:
- Assigned: The storage pool is protected by at least one assigned hot spare disk.
- Available: There are available disks that can protect the storage pool, but no hot spare has been assigned yet.
- Not available: There are no available hot spare disks that can protect the storage pool.
- The Available Disks section displays hard disks that can be assigned as hot spare disks. To assign a hot spare disk, check the box next to the disk you wish to assign as a hot spare.
- Click Apply to save settings.
Note:
- When a hard disk is assigned as a hot spare disk, all data on disk is erased. Before assigning a hot spare disk, make sure the disk has no important data on it.
- A RAID assembled by HDDs will not be automatically repaired by SSD hot spare disks and vice versa.
To configure hot spare settings for a storage pool:
- Click Configure.
- In the Hot Spare Targets tab, storage pools that can be protected by hot spare disks will be listed. If you uncheck the boxes, the corresponding storage pools will not be automatically repaired by hot spare disks when degraded.
- In the Cross-device Hot Spare tab, you can allow hot spare disks on one device to repair a degraded RAID located on a different device.
- Click OK to save the settings.