Disk
SurferCloud cloud hosts currently offer five types of disks: local ordinary disks, local SSDs, ordinary cloud disks, SSD cloud disks, and RSSD cloud disks.
Introduction to Types
Cloud Disks
As a fundamental block storage product in cloud computing, cloud disks provide persistent storage space for cloud hosts. They have independent life cycles, network-based access, and offer large capacity, high reliability, scalability, ease of use, and cost-effectiveness. Currently, SurferCloud provides SSD Cloud Disks and Ordinary Cloud Disks as options.
Local Disks
Local disks are virtual hard disks associated with the same host as the cloud host CPU/memory and are characterized by lower latency. Their life cycle aligns with that of the cloud host, and they cannot be bound or unbound. Data protection is ensured through RAID. SurferCloud currently offers SSD Local Disks and Ordinary Local Disks as options.
Selection Guide
Disk Comparison Overview
Detailed Comparison
| Parameter | RSSD Cloud Disk | SSD Cloud Disk | Ordinary Cloud Disk | Local SSD | Ordinary Local Disk |
|---|---|---|---|---|---|
| General Description | New cloud disk product with ultra-high performance and latency of only 0.1 milliseconds. Currently, only fast-cutting series of cloud hosts are supported | Excellent comprehensive performance and stability, suitable for most scenarios, with balanced prices | Maximum optional capacity, suitable for low IO scenarios that require redundancy | Excellent performance and latency, but the highest single cost | Local disk enhanced with IO optimization technology, boasting better IO performance than ordinary SATA disks |
| Recommended Scenarios | High-performance databases, Elastic Search search and other I/O intensive applications that require low latency | I/O intensive applications, relational databases, NoSQL databases, and other application scenes that ordinary disks cannot satisfy | Log storage, large file sequential read and write, small relational databases, development test environment, Web servers | Large relational databases with application layer redundancy, NoSQL databases, high-frequency trading, etc. | Small relational databases, various enterprise applications, data analysis, game servers |
| Underlying Media | SSD | SSD | SATA | SSD | SATA |
| IO Performance Reference | Stable 1200000 | Stable 24000 | Peak 1000 | Peak 80000 | Peak 8000 |
| Latency | 0.1ms | 0.5-3ms | 10ms | 0.3ms | 0.3ms |
| Redundancy Mechanism | 3 replicas | 3 replicas | 3 replicas | 2 replicas | 2 replicas |
| Capacity | 20-32000GB | 20-8000GB | 20-8000GB | 20-1000GB | 20-2000GB |
Performance
Detailed Performance Parameters
| Parameter | RSSD Cloud Disk | SSD Cloud Disk | Ordinary Cloud Disk | Local SSD | Ordinary Local Disk |
|---|---|---|---|---|---|
| Optional Capacity (Data Disk) | 20-32000GB | 20-8000GB | 20-8000GB | 20-1000GB | 20-2000GB |
| Random Read (IOPS) | min{1800+50 * capacity,1200000} | min{1200+30 * capacity,24000} | 1000 | 80000 | 8000 |
| Random Write (IOPS) | min{1800+50 * capacity,1200000} | min{1200+30 * capacity,24000} | 1000 | 15000 | 8000 |
| Sequential Read (MBps) | min{120+0.5 * capacity,4800}MBps | min{80+0.5 * capacity,260}MBps | 100 | 2000 | 150 |
| Sequential Write (MBps) | min{120+0.5 * capacity,4800}MBps | min{80+0.5 * capacity,260}MBps | 100 | 1000 | 150 |
| Average Latency | 0.1ms | 0.5-3ms | 10ms | 0.3ms | 0.3ms |
Note: The performance of the RSSD cloud disk is also related to the host configuration. For details, please refer to Relationship between RSSD Performance and Instance Performance.
Testing Method
Refer to UDisk Testing Tool
Model/Feature Support
Model Support
| Model | System Disk | Data Disk |
|---|---|---|
| Fast-cut cloud host series | RSSD cloud disk | Ordinary cloud disk/SSD cloud disk/RSSD cloud disk |
| General type N | SSD cloud disk | Ordinary cloud disk/SSD cloud disk |
| General type N | Ordinary local disk | 1 ordinary local disk, multiple cloud disks can be stacked |
| General type N | SSD local disk | 1 SSD local disk, multiple cloud disks can be stacked |
| High-frequency type C | SSD local disk | 1 SSD local disk, multiple cloud disks can be stacked |
| GPU type G | SSD cloud disk | Ordinary cloud disk/SSD cloud disk |
| GPU type G | SSD Local Disk | 1 SSD local disk, multiple cloud disks can be stacked |
| GPU type G | SSD cloud disk | Ordinary cloud disk/SSD cloud disk |
Feature Support
| Disk Type | Data Ark | Ordinary Snapshot |
|---|---|---|
| RSSD Cloud Disk | Supported | Supported |
| SSD Cloud Disk | Supported | Supported |
| Ordinary Cloud Disk | Supported | Supported |
| SSD Local Disk | Not Supported | Not Supported |
| Ordinary Local Disk | Supported (both system disks and data disks need to be activated simultaneously) | Not Supported |
FAQ
Why can't I see the disk type I want in some available zones?
The requested disk types may not be available in certain zones, or there may be restrictions due to inventory limitations. If you cannot select the required disk, please contact technical support.
Can a cloud host mount multiple local disks?
A cloud host includes a system disk and a data disk by default. A host can only mount one local data disk, which cannot be unloaded and mounted to another host.
However, a host can mount 26 cloud data disks and can be freely unloaded.
Is the system disk expansion function supported?
SSD cloud disk: support expansion from 20 GB to 500 GB.
Ordinary local disk/SSD local disk: support expansion from 20 GB to 100 GB.
