Help Center/ Dedicated Distributed Storage Service/ User Guide (Paris and Amsterdam Regions)/ Introduction/ Storage Pool Types
Updated on 2022-02-21 GMT+08:00
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Storage Pool Types

DSS provides two types of storage pools, which differ in I/O performance and price. You can select the storage pool type based on your service requirements.

The disk type must be consistent with the storage pool type you selected.

Application Scenarios

  • High I/O storage pool supports only high I/O disks. It can deliver a maximum of 1500 IOPS per TB and a minimum of 6 ms read/write latency. This type of storage pools is designed for mainstream high-performance, high-reliability application scenarios, such as enterprise applications, large-scale development and testing, and web server logs.
  • Ultra-high I/O storage pool supports only ultra-high I/O disks. It can deliver a maximum of 8000 IOPS per TB and a minimum of 1 ms read/write latency. This type of storage pools is perfect for read/write-intensive application scenarios. For example, the distributed file systems in the HPC scenarios or NoSQL and relational databases in I/O-intensive scenarios.

Performance

Key metrics of the storage pool performance include read/write I/O latency, IOPS, and throughput.

  • IOPS: Number of read/write operations performed per second
  • Throughput: Amount of data successfully transmitted per second, that is, the amount of data read from and written to the pool
  • Read/write I/O latency: Minimum interval between two consecutive read/write operations
Table 1 Storage pool performance

Metric

High I/O

Ultra-high I/O

IOPS

1500 IOPS/TB

8000 IOPS/TB

Read/write I/O latency

6 ms to 10 ms

1 ms to 3 ms
Parent topic: Introduction