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Synology NAS User's Guide
Based on DSM 6.1
30 Chapter 5: Manage Storage Space
Manage iSCSI Targets
Go to Storage Manager and click the iSCSI Target tab to manage iSCSI Targets on your Synology NAS. The
maximum number of iSCSI Targets varies depending on the model. For more information, please refer to
“Manage iSCSI LUNs”.
Manage iSCSI LUNs
An iSCSI LUN (logical unit number) represents an individually addressable portion of an iSCSI Target. An iSCSI
LUN can be mapped to multiple iSCSI Targets to perform storage operations such as read or write.
Go to Storage Manager and click the iSCSI LUN tab to manage iSCSI LUNs on your Synology NAS. The
maximum number of iSCSI LUNs varies depending on the model. Detailed product specifications can be found
on our website: www.synology.com.
Clone iSCSI LUNs
LUN Clone
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allows you to create near-instantaneous virtual copies of a LUN. It means much higher productivity
and less complex deployment during system-wide operations. LUN Clone also consumes only a fraction of
storage at the time of creation.
Go to Storage Manager and click the Clone button to make a writable copy of an iSCSI LUN or an iSCSI LUN
snapshot
Take iSCSI LUN Snapshots
LUN Snapshot
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allows you to create up to 256 snapshots per LUN using point-in-time technology without having
any impact to system performance. It is efficient for your valuable storage space and also increases the level of
protection, letting you easily recover valuable data.
Go to Storage Manager and click the Snapshot button to take iSCSI LUN snapshots.
Manage Hard Disks
The HDD/SSD tab allows you to monitor the status of the hard disks installed in your Synology NAS, providing
options to manage and analyze hard disk performance and health. To see this tab, go to Storage Manager and
click HDD/SSD. For more detailed instructions, please see DSM Help.
Enabling Write Cache Support
Enabling write cache support enhances the performance of your Synology NAS. Only certain hard disk models
support this feature. To ensure data protection while using write cache support, usage of a UPS device is
strongly recommended. We also suggest the system be shut down properly every time after use. Disabling write
cache will reduce the chances of data loss caused by abnormal power outages, but system performance will
decline.
Running S.M.A.R.T. Tests
Disk S.M.A.R.T. tests examine and report the status of your hard disk, alerting you to possible disk failures. We
recommended promptly changing your disk if any errors are detected. S.M.A.R.T. tests can also be scheduled to
run automatically by creating tasks.
Checking Disk Info
The Disk Info section displays a hard disk's model name, serial number, firmware version, and total size.
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LUN Clone and Snapshot are only available on specific models.
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