What EVS Disk Types Are Available?
EVS disk types are classified based on I/O performance. The following table describes the details of each type. EVS disks differ in performance and price. You can choose whichever disk type that is the best fit for your applications by referring to Disk Types and Performance.
Data Block Size (KiB) | Max. IOPS | Max. Throughput (MiB/s) |
---|---|---|
4 | About 50,000 | About 195 |
8 | About 44,800 | About 350 |
16 | About 22,400 | About 350 |
32 | About 11,200 | About 350 |
Parameter | Extreme SSD | Ultra-high I/O | High I/O |
---|---|---|---|
IOPS per GiB/EVS disk | 50 | 50 | 8 |
Max. IOPS/EVS disk | 128,000 | 50,000 | 5,000 |
Baseline IOPS/EVS disk | 1,800 | 1,800 | 1,800 |
IOPS burst limit/EVS disk | 64,000 | 16,000 | 5,000 |
Disk IOPS | Min. [128,000, 1,800 + 50 x Capacity (GiB)] | Min. (50,000, 1,800 + 50 x Capacity) | Min. (5,000, 1,800 + 8 x Capacity) |
Max. throughput | 1,000 MiB/s | 350 MiB/s | 150 MiB/s |
Disk throughput | Min. [1,000, 120 + 0.5 × Capacity (GiB)] MiB/s | Min. (350, 120 + 0.5 × Capacity) MiB/s | Min. (150, 100 + 0.15 × Capacity) MiB/s |
API name NOTE: This API name is the value of the volume_type parameter in the EVS API. It does not represent the type of the underlying hardware device. | ESSD | SSD | SAS |
Typical scenarios |
| Read/write-intensive workloads that demand ultra-high I/O and throughput, such as distributed file systems used in HPC scenarios or NoSQL and relational databases used in I/O-intensive scenarios. Typical databases include MongoDB, Oracle, SQL Server, MySQL, and PostgreSQL. | Mainstream applications requiring high performance and high reliability, such as large-scale development and test environments, web server logs, and enterprise applications. Typical enterprise applications include SAP applications, Microsoft Exchange, and Microsoft SharePoint. |