disco ssd Hyperconverged Hardware Options Recommended Guide | Phase 3: SSDs and HDDs

disco ssd Hyperconverged Hardware Options Recommended Guide | Phase 3: SSDs and HDDs

m2SSD OEMdisco SSD This issue of the SMTX OS Hardware Selection Recommendation Guide continues to share with you the content related to storage in stand-alone hardware configurations – SSDs SSD and HDD chapter. The first two issues excerpted the CPU selection memory selection reference in the stand-alone hardware configuration disco SSD, interested readers can click to review.

if you want to get the full guidedisco ssd, clickable here Download.

2.5″ SSDs are divided into SATA, SAS and U.2 NVMe interfaces. Currently, SATA 3.0 interface rates are 600 MBps, SAS 3.0 interface rates are 1200 MBps, and U.2 NVMe generally uses PCIe 3.0 x 4 with an interface rate of 3.938 GB/s.

NVMe SSD is the fastest, but the cost is relatively high, SAS SSD price is also more expensive, the same investment, not as good as the purchase of NVMe SSD brought by the benefit, if from the cost consideration, SAS SSD is not recommended, but if the cost is not considered or the existing equipment is SAS SSD, SAS SSD performance is better than SATA SSD, it is also worth considering the application of SAS SSD.

> based on the above, it is recommended that SATA interface SSDs that are still mainstream at present.

at least 2 blocks. The first two partitions of the 2 SSDs will form a soft RAID to place the OS, Zookeeper and MetaServer to ensure their security, and the rest of the space will be used as Journal and Cache. Two SSDs (2 × 6 Gbps) guarantee enough bandwidth to match the 10 Gigabit network (10 Gb).

the total capacity of the SSD should be kept at 10% – 20% of the total capacity of the HDD, if the total capacity of the HDD is 12 TB, it is recommended that the SSD choose 2 blocks of 960 GB.

SSDs are mainly divided into three types at the application level: Read-intensive, Mixed read/write and Write-intensive.

read-intensive SSDs are mainly used in boot disks, Web servers, data analysis and other applications; Read-write hybrid SSDs are suitable for applications such as caching and high-speed storage; Write-dense SSDs are better suited for applications such as high-performance computing (HPC), high-definition imaging and video (HDIV), high data rate analytics, and databases.

 The read/write ratio of some typical applications is as follows:

Intel S4510 read-intensive SSD and Intel S4610 read-write hybrid SSD theoretical performance comparison reference is as follows:

It can be seen that the sequential read and write performance is basically the same, and the random read performance is basically the same, but the random write performance of the read-intensive S4510 SSD is about 30% lower than the random write performance of the read-write hybrid S4610 SSD (the nominal value is the difference between the single disk S4510 and S4610 both 1.92 T capacity points; 960 G capacity points will be 41% different; 480 G capacity points will be 147% different).

DWPD (Drive Writes Per Day) is generally used to measure the life of an SSD. DWPD refers to the number of complete writes to an SSD per day during the warranty period, and the more times, the longer the life of the SSD, which also means that it is more expensive. Write-intensive SSDs are the mainstream SSDs in the market due to their long write life and high price.

each SSD manufacturer corresponds to different types of SSD models, the DWPD of read dense SSDs is basically 0-2, such as Intel S4510, Samsung PM883, the DWPD of read-write hybrid SSDs is basically 3-5, it is recommended to prefer read-write hybrid SSDs. If you must choose a read-dense SSD, it is recommended to choose an SSD with DWPD

 list of mainstream SSDs is as follows:

In summary, the overall recommendation of SSDs is as follows:

Considering HDD concurrent performance, it is recommended to choose a large number of HDD configurations. In addition, considering the single-disk failure recovery speed, it is recommended to recommend low-single-disk HDDs, such as 8T total capacity requirements, 4 x 2T solution is better than 2 x 4T solution, and 2 x 4T solution is better than 1 x 8T solution.

The overall capacity requirements generally come from customer needs, and it is recommended to choose more than 4 HDDs as much as possible when considering the reservation. For the choice of single-disk capacity, generally 2.5″ HDD capacity is not more than 2.4T, and 3.5″ HDD capacity ranges relatively large, from 1T to 14T.

At present, HDDs are mainly divided into SATA and SAS interfaces, SATA HDD generally rotates at 7200 rpm, SAS HDD speeds are divided into 7200 rpm, 10000 rpm and 15000 rpm, the higher the speed, the faster the read and write speed. High-speed HDDs are recommended for performance assurance, and low-RPM HDDs are recommended for cost reduction.

 list of mainstream HDDs is as follows:

In summary, the overall HDD recommendation is as follows: m2SSD OEM disco SSD