
Synology NAS User's Guide
Based on DSM 4.3
34 Chapter 5: Manage Storage Space (for RS10613xs+)
Manage iSCSI Targets
By mapping iSCSI Targets and iSCSI LUNs, client servers can access space on a storage server as if it were a
local disk. In reality, all data transferred to the disk are actually transferred over the network to the storage server.
Create, Edit, or Remove iSCSI Targets
You can manage iSCSI Targets by going to Main Menu > Storage Manager > iSCSI Target. For detailed
instructions regarding how to create, modify, remove, or register iSNS server information, please refer to DSM
Help.
Manage Hard Disks
HDD Management section of Storage Manager allows you to monitor the status of hard disks installed on your
Synology NAS, providing options to manage and analyze hard disk performance and health. To see this section,
please go to Main Menu > Storage Manager > HDD Management.
Enable Write Cache Support
Depending on the model, write cache support can be enabled in order to enhance the performance of your
Synology NAS. Disabling write cache will reduce the chances of data loss caused by abnormal power outages,
but system performance will decline. To modify write cache support settings, please go to Main Menu > Storage
Manager > HDD Management.
We recommend using a UPS to ensure data protection when write cache support is enabled. In addition, the
system should be shut down properly every time after use.
S.M.A.R.T. Test
S.M.A.R.T. test examines and reports the status of your hard disks, alerting you to possible disk failures. If you
want to a run S.M.A.R.T. test, go to Main Menu > Storage Manager > HDD Management. For more information
regarding S.M.A.R.T. tests, please refer to DSM Help.
Hot Spare
Hot Spare disks are standby hard disks that can repair a degraded RAID Group by automatically replacing a
failed disk. Hot spare disks need not be assigned to a specific RAID Group, but may be globally assigned to
repair any RAID Group within your Synology NAS. Before assigning hot spare disks, please see the following
requirements:
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).
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.
Manage Hot Spares
You can assign, remove, or manage Hot Spare disks by going to Main Menu > Storage Manager > Hot Spare.
Please refer to DSM Help for information regarding Hot Spare management.
Storage Overview
Storage Overview shows the status of installed hard disks, cable connections, and hardware status lights. You
can view Storage Overview by going to Main Menu > Storage Manager > Storage Overview. Please refer to
DSM Help for a detailed explanation of this section.
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