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Version: TOS 7

Hyper Cache

Hyper Cache is an SSD cache acceleration technology developed by TerraMaster. Compared with traditional SSD caches, Hyper Cache can provide 2 cache modes to choose from to meet different usage needs, and it can also create disk arrays for SSDs to increase cache speed and security. TerraMaster Hyper Cache can multiply storage performance and create a more efficient and reliable hybrid storage for you.


Management and Operations​

Through the function configuration buttons, you can perform the following operations:

  • Create: Create an SSD cache.
  • Edit: When a disk in the SSD cache array fails, a new SSD can be used for replacement and repair.
  • Delete: Delete the created SSD cache.

How to Create an SSD Cache?​

  1. Insert the SSD into the TNAS hard disk slot.
  2. Go to Storage Management > Hyper Cache, and click "Create".
  3. Select a volume to create a cache.
  4. Select the SSD used to create the cache and choose an array type for it, then click "Next".
  5. The system will prompt you that all data in the SSD will be deleted to create the cache. Please click "Confirm" to continue. Enter the administrator password and confirm again to complete this step.
  6. Select an appropriate cache mode according to your needs, and click "Next".
  7. On the pop-up confirmation settings page, click "Confirm".

What Are the Differences Between Different Cache Modes?​

Balanced Mode:
This mode provides preloaded read cache acceleration. Data will be written to both the SSD cache and the hard disk at the same time, so the write speed of data will be reduced to a certain extent, but the read speed can be improved. Balanced Mode can avoid the risk of data loss caused by SSD failure or power outage midway; in this mode, using 2 SSDs to form a RAID 0 array can increase the cache speed. Balanced Mode is suitable for users who have low requirements for write cache performance but high requirements for read cache performance.

Read-Write Mode:
This mode provides both read and write cache acceleration. Data will be written to the SSD cache first and then to the hard disk later. The disadvantage of Read-Write Mode is that it is not safe enough—once the SSD fails or there is a power outage midway, data may be lost. If you need to improve the security of Read-Write Mode, you can use multiple SSDs to form a RAID 1 or RAID 5 array to provide redundancy for the cache SSD. This can not only increase the cache capacity but also avoid the risk of data loss caused by SSD failure. Read-Write Mode is suitable for users who have high requirements for cache read and write performance.


How Is the SSD Cache Capacity Calculated?​

Take the smaller value of the following two:

  1. The capacity of the disk used as the SSD cache disk.
  2. The capacity of the target volume for SSD cache creation.