
Synology NAS User's Guide
Based on DSM 4.3
28 Chapter 4: Manage Storage Space
Hot Spare
Hot spare
1
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).
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 Synology NAS, as long as the volume/Disk Group/iSCSI LUN matches the
following criteria:
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.
Managing Hot Spares
Go to Storage Manager > Hot Spare > Manage to assign and manage hot spare disks. For more detailed
information, please see DSM Help.
Manage External Disks
External USB or eSATA disks can be attached to the USB or eSATA port of your Synology NAS for backup or file
sharing purposes.
2
Go to Main Menu > Control Panel > Devices and Printers > External Devices to manage attached external
disks or setup printers. The External Devices tab provides options to view device information, change formats,
or eject the device. The Printer tab provides options to setup USB or network printers. For more detailed
instructions, please see DSM Help.
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1
The hot spare feature is available on specific models only.
2
eSATA is supported on specific models only. Visit www.synology.com for more information.
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