Storage Pool Types and Performance

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 1,500 IOPS per TB and a minimum of 1 to 3 ms read/write latency (single queue, 4 KiB data blocks). This type of storage pools is designed for mainstream high-performance, high-reliability applications, 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 8,000 IOPS per TB and a minimum of 1 ms read/write latency (single queue, 4 KiB data blocks). This type of storage pools is perfect for read/write-intensive application scenarios, such as the distributed file systems in the HPC scenarios or NoSQL and relational databases in I/O-intensive scenarios.

Storage Pool 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 read from and written into a storage pool per second
Read/write I/O latency: Minimum interval between two consecutive read/write operations

**Table 1** Storage pool performance
Parameter	High I/O	Ultra-high I/O
IOPS	1,500 IOPS/TB	8,000 IOPS/TB
I/O read/write latency (single queue, 4 KiB data blocks)	1 ms to 3 ms	1 ms
Typical application scenarios	Common development and test environments	Transcoding services I/O-intensive workloads NoSQL Oracle SQL Server PostgreSQL Latency-sensitive applications Redis Memcache