Today, IT professionals and storage administrators often use SSDs (Solid State Drives) to replace HDDs (mechanical hard drives). Although SSD drives have dominated data center storage, there are some misconceptions about their use, performance, and cost. Once people eliminate the misunderstanding behind SSD hard disk application problems, they will find that using SSD hard drives is beneficial for storage management and computing, which can improve data center efficiency.
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Myth 1: SSD hard drive is not durable
In people's misunderstanding, there is a problem with the durability of SSD hard drives. The current SSD hard drives can continue to be used for many years due to better electronic components, signal processing and smarter fault detection and correction, so SSD hard drives Longer service life.
In addition, SSD drives are designed for write workloads and can be measured by the number of writes per day. Conversely, an HDD hard disk that handles heavy write loads can only allocate more space, which increases cost or reduces capacity.
The daily total number of writes for some HDD drives is usually not much different from the SSD drive specifications, which means that HDD drives are not out of date. The bottom line is that SSD drives are as reliable as HDD drives and faster.
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Myth 2: SSD hard disk management is complicated
Another early problem with SSD hard drives was the write issue. It is the factor of the SSD hard disk to delete the block. The SSD hard disk does not need to mark it as a free block, but needs to reset the data on the SSD to the unwritten state, which can make the block available. The complicating thing is that this can only be done in flash-based memory, usually in 2MB oversized blocks. Any valid data in a very large block must be rewritten elsewhere.
When a write operation is performed from the server, even if the fast memory buffer is sent from the server, the write speed is greatly reduced. This is fine if you use the TRIM command to pre-clear blocks. TRIM is built into the driver, but the user may need to verify that it is open in the operating system. When using TRIM, the write speed should be as fast as when the hard disk is empty.
Also, don't defragment your SSD drive. This only wastes time and I/O performance and reduces its useful life. The reason is simple: due to the writing process, the blocks are randomly placed in the entire SSD hard disk space, but not affected by any delay like the HDD hard disk.
On the other hand, you need to view the compressed flash data on the SSD hard drive. This will further improve performance because it is typically five times less than the number of blocks written and read, and effectively increases capacity by about five times.
SSD drives can increase capacity in any type of networked storage system because if the compression and decompression are done on the server, the network data load is reduced by a factor of five. This will save a lot of money, which may be just because SSD hard drives have a lot of extra I/O cycles that can be used for compression.
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Myth 3: SSD hard drives can replace HDD hard drives in arrays
This is another issue that IT professionals and storage administrators may be troubled with using SSD drives. Today's SSD drives are so fast that traditional array controllers are not as fast. The storage array is designed around the I/O performance of the HDD hard drive, which means that the I/O speed will be reduced by a factor of 1000 and the sequential operation speed will be reduced by a factor of 100.
The storage array controller is designed to consolidate the data streams of many slow HDD drives into several Fibre Channel links of moderate speed, so they will become a serious bottleneck for SSD hard drive applications. Users should use SSD hard disk-centric storage devices and consider using a multi-channel 100 GbE storage backbone.
Servers have similar bottlenecks because the original Serial Attached SCSI (SAS) and Serial Advanced Technology Attachment (SATA) interfaces cannot keep up with the speed of SSD drives. The new NVMe protocol is faster and can significantly reduce system overhead by consolidating interrupts and simplifying queue management. IT professionals and storage administrators can use NVMe Ethernet as a way to share drives across the entire server cluster, speeding up the hyper-integrated system.
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Myth 4: SSD hard drives are too expensive
Another major problem with SSD drives is the high price. In the past few years, the price of SSD hard drives has fallen rapidly, but with the new 3D-NAND manufacturing method, the price has stabilized. This problem has been solved and one can expect its price to fall again.
In addition, the price difference often discussed by industry professionals is a mix of SATA hard drives and enterprise SSD hard drives. The price of SATA SSDs is less than half that of SAS drives of the same capacity, but the performance is far superior to SAS drives, which is the reason for the decline in SAS hard drive prices. Of course, some expensive NVMe hard drives have also been deployed. But all the signs indicate that the price of both drives is rapidly approaching the price of equivalent capacity SATA SSDs.
Even so, the price of an SSD drive is still much higher than that of an HDD drive. Keep in mind that servers that use SSD drives can do more work faster, so you can offset the cost difference. Don't forget that compression technology will make SSD hard drives store data at a lower price than HDD drives.
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Myth 5: The capacity of the SSD hard drive is not big enough
Finally, one of the problems with SSD drives is their small capacity. In fact, some SSD hard drives have exceeded the capacity of large-capacity HDD drives. Today, the market is launching a 2.5-inch 32-TB SSD drive, and IT professionals can expect a 50-TB SSD drive to be available soon. With a capacity of 16TB or less, SSD drives will use fewer chassis, less power, and provide better results than HDD drives. SSD hard drive capacity is no longer a problem in today's data centers. 
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