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Version: TOS 6

Hyper Cache

Hyper Cache is a unique SSD cache acceleration technology developed by TerraMaster. Compared with traditional SSD cache, Hyper Cache can offers two cache modes to choose from to suit different needs, and can also create disk arrays for SSDs to increase cache speed and security. TerraMaster Hyper Cache can double the storage performance and create more efficient and reliable hybrid storage for you.

Management​

Through the buttons in the management tab, you can perform the following operations：

  • Create: Establish an SSD cache；
  • Edit: If a disk in the SSD cache array fails, replace it with a new SSD for repair；
  • Delete: Remove the SSD cache；

How do I create an SSD cache?​

  1. Insert the SSD into the TNAS hard disk slot.
  2. Navigate to TOS desktop > Control Panel > Storage Management > Hyper Cache, and click "Create".
  3. Choose a volume for the cache.
  4. Select the SSD and choose the array type, then click "Next".
  5. Confirm that all SSD data will be deleted to create the cache. Enter the administrator password and confirm again to proceed.
  6. Choose the appropriate cache mode based on your needs and click "Next".
  7. Confirm settings on the pop-up confirmation page by clicking "Confirm".

What are the differences between various cache modes?​

Balance mode This mode provides preloaded read cache acceleration. The data will be written to the SSD cache and the disk at the same time, the data writing speed will be reduced to a certain extent, but the reading speed can be improved. Balanced mode can avoid the risk of data loss due to SSD failure or power failure; In this mode, the cache speed can be increased by using 2 SSDs to form a RAID 0 array. Balanced mode is suitable for users who do not have high requirements for write cache performance but high requirements for read cache performance.

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

How is SSD Cache Capacity Calculated?​

The minimum value among the following three is taken:

  1. The capacity of the disk used as the SSD cache.
  2. The capacity of the target volume for which the SSD cache is being created.
  3. The maximum cache capacity allowed by the system memory = Total system memory {G} x 0.6 - Used system memory {G} * 1024 / 5.5 . TOS 6.0.694 and later versions have removed this restriction.