User`s guide

Synology DiskStation User's Guide
Based on DSM 4.2
26 Chapter 4: Manage Storage Space
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 Main Menu > Storage Manager and click the iSCSI LUN tab to manage iSCSI LUNs on your
Synology DiskStation. The maximum number of iSCSI LUNS varies depending on the DiskStation model. For
detailed product specifications, please refer to www.synology.com.
Clone iSCSI LUNs
LUN Clone
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Go to Main Menu > Storage Manager and click the Clone button to make a writable copy of an iSCSI LUN or an
iSCSI LUN snapshot
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.
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 Main Menu > Storage Manager and click the Snapshot button to take iSCSI LUN snapshots.
Manage Hard Disks
The HDD Management tab allows you to monitor the status of the hard disks installed in your DiskStation,
providing options to manage and analyze hard disk performance and health. To see this tab, go to Main Menu >
Storage Manager and click HDD Management. For more detailed instructions, please see DSM Help.
Enabling Write Cache Support
Enabling write cache support enhances the performance of your DiskStation. 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.
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LUN Clone and Snapshot are only available on specific models.