SSD cache: everything you need to know

SSD cache
One of the advantages of choosing an SSD in the debate about SSD VS HDD is the ability to install the SDD as a boot drive. This practically gives you the maximum speed that the SDD can achieve – if it has the capacity and if your system can accommodate a secondary data drive, since programs and data are installed and stored there.

However, SSDs can also be used as an SSD cache.

Here, the system can use another turntable hard drive as the startup drive, with the SSD storing data with lower latency, which you need to access temporarily and quickly for a controller-based solution (ie “hot” data).

By using an SSD cache, you can reduce the load on I / O-intensive workloads. Remember to run a virtual machine, a Docker container, or even a database.

An SSD cache effectively increases system performance and can be managed automatically by the system. Incidentally, this also significantly contributes to you landing on the best SSD for games.

How SSD caches are implemented

There are several ways to implement an arrangement for the SSD cache. Windows 10 Ultrabooks are characterized by SSD cache arrangements or SSD boot drives as a prerequisite (provided that you note that Windows 10 must be configured to boot in UEFI mode for bootable layers with more than 2 TB, which is not the case Case is. T support in legacy boot mode).

For newer desktops, Intel’s Optane Memory is a cool thing for a system accelerator that uses the SSD cache. It is a cross point memory, not volatile, but faster than NAND flash. You can also implement an SSD cache for Windows 10, 8 and 7 with conventional SATA SSDs with low capacity or even with mSATA. While the SATA SSD is to be used in the 2.5 inch form factor, the mSATA SSD module is both this and the physical interface of the same name. While it’s an extinct technology, it’s easy to use, reliable, and fast.

Synology SSD cache

Some of the best NAS on the market have system cache support with an SSD. The Synology NAS primarily requires some discussion – all newer models offer the option of creating an SSD cache using the PCIe bus or NVMe M.2 SSDs. It is recommended to avoid QLC-NAND for caching drives and to prefer 3D-MLC-NAND or 3D-TLC-NAND as these are normally reserved for long-term storage. SATA SSDs are also controversial here because Synology DiskStation doesn’t support them.

FreeNAS SSD cache

Interestingly, FreeNAS-certified servers that target NAS systems for small and medium-sized businesses in the upper price range recommend SSDs with high performance for the read cache (in L2ARC capacity) as well as SSD-based (or flash-based) Write log devices (known as SLOG) for synchronous writes (similarly durable).

However, it was argued that adding an SSD as an SSD cache arrangement to the FreeNAS is not worthwhile. Regardless, adding is a super easy process. You can simply go to the storage via the web interface and click on Volume Manager. The ZFS volume can be selected. If you click the plus icon and select the Cache (L2ARC) option, all you have to do is click the “Add Volume” button.

QNAP SSD cache

When it comes to QNAP, a higher HIT rate can be achieved using the SSD cache arrangement, but it requires more resources from your system due to the use of the Least Recent Used (LRU) algorithm as standard.

The LRU algorithm removes the elements that you least use first, which makes it faster. However, since the cached data needs to be tracked, your CPU uses all the more resources. The other option is the FIFO (First In, First Out). While there is a lower HIT rate, it puts less strain on your system.

Ultimately, a QNAP SSD cache arrangement can increase performance by up to ten times while reducing latency three times as much, which is a great advantage for applications that require IOPS to improve the workflow.

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