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Synology NAS User's Guide
Based on DSM 6.2
31 Chapter 5: Manage Storage Space
SSD Cache
SSD cache
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drives can be installed and mounted in a read-only (RAID 0) or read-write (RAID 1, RAID 5, RAID 6)
configuration to boost the read/write speed of a volume. You can create a cache and view related information at
Storage Manager > SSD Cache.
Please refer to the Hardware Installation Guide of your Synology NAS for information regarding SSD installation.
For more detailed information regarding SSD management, please see DSM Help or Synology SSD Cache
White Paper.
Hot Spare
Hot spare
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drives are standby hard 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:
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 drive size must be equal to or larger than the size of the smallest drive in the storage pool.
Managing Hot Spares
Go to Storage Manager > Hot Spare > Manage to assign and manage hot spare drives. For more detailed
information, please see DSM Help.
Manage External Drives
External USB or eSATA drives can be attached to the USB or eSATA port of your Synology NAS for backup or
file sharing purposes.
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Go to Control Panel > External Devices to manage attached external drives 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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SSD cache is supported on specific models only. Visit www.synology.com for more information
2
The hot spare feature is available on specific models only.
3
eSATA is supported on specific models only. Visit www.synology.com for more information.
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