Hot Spare*
Hot spare disks are standby hard disks that can repair a degraded volume/Disk Group/iSCSI LUN by automatically replacing a failed disk. Hot spare disks can be globally assigned to protect any volume/Disk Group/iSCSI LUN within your DiskStation, as long as the volume/Disk Group/iSCSI LUN matches the following criteria:
- The RAID type of the volume/Disk Group/iSCSI LUN 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 volume/Disk Group/iSCSI LUN.
To set up hot spare disks:
- Click Manage.
- A dialog appears, displaying the hot spare status of each volume/Disk Group/iSCSI LUN, as well as available disks. Volume/Disk Group/iSCSI LUN status includes the following:
- Assigned: The volume/Disk Group/iSCSI LUN is protected by at least one assigned hot spare disk.
- Available: There are available disks that can protect the volume/Disk Group/iSCSI LUN, but no hot spare has been assigned yet.
- Not available: There are no available hot spare disks that can protect the volume/Disk Group/iSCSI LUN.
- The Available Disks sections 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 volume/Disk Group/iSCSI LUN:
- Click Configure.
- In the Hot Spare Targets tab, volumes/Disk Groups/iSCSI LUNs that can be protected by hot spare disks will be listed. If you uncheck the boxes, the corresponding volumes/Disk Groups/iSCSI LUNs will not be automatically repaired by hot spare disks when degareded.
- 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.
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*Only available on certain models.