User Manual

Synology NAS User's Guide
Based on DSM 6.2
30 Chapter 5: Manage Storage Space
RAID/File System Scrubbing
RAID/file system scrubbing is a data maintenance function that inspects storage pools and repairs any detected
data inconsistencies. RAID scrubbing can be used with storage pools that implement SHR (comprised of three or
more drives), RAID 5, RAID 6, or RAID F1. File system scrubbing can be used with volumes in Btrfs file system.
We recommend regularly performing RAID/file system scrubbing in order to maintain data consistency and avoid
losing any critical data in the event of drive failure. For detailed instructions, please see DSM Help.
SSD TRIM
If a volume consists entirely of SSDs (Solid State Drives), we recommend enabling SSD TRIM. This feature
optimizes the read and write performance of volumes created on SSDs, increasing efficiency as well as
extending the lifetime of your SSDs.
Before trying to set up SSD TRIM, please see DSM Help for detailed instructions and more limitations.
Note:
 SSD TRIM is only available on certain Synology NAS models and RAID types.
 Some SSD models are not able to perform SSD TRIM on RAID 5 and RAID 6 volumes. Please refer to the
compatibility list at www.synology.com.
Manage Hard Drives
The HDD/SSD tab allows you to monitor the status of the hard drives installed in your Synology NAS, providing
options to manage and analyze hard drive 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 drive 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
Drive S.M.A.R.T. tests examine and report the status of your hard drive, alerting you to possible drive failures.
We recommend promptly changing your drive if any errors are detected. S.M.A.R.T. tests can also be scheduled
to run automatically by creating tasks.
Checking Drive Info
At Storage Manager > HDD/SSD > HDD/SSD, click on the down arrow next to the name of a hard drive to view
the hard drive's model name, serial number, firmware version, and total size.