PolarDB for MySQL provides four different editions: Cluster Edition, Multi-master Cluster (Database/Table) Edition , Single Node Edition, and X-Engine Edition. Each edition provides different specifications of compute nodes.
Specifications of compute nodes in different editions
The following sections describe the specifications of compute nodes in different PolarDB for MySQL editions:
- A Cluster Edition or Multi-master Cluster (Database/Table) Edition cluster supports the General-purpose and Dedicated specifications.
- Dedicated: Computing resources such as CPUs that are allocated to each cluster are exclusive to the cluster. This improves the stability and reliability.
- General-purpose: Idle computing resources such as CPUs are shared among clusters on the same server for cost-effectiveness.
- A Single Node Edition cluster uses nodes of the burstable performance type and shares resources in a computing resource pool. This improves resource usage. The Single Node Edition architecture reduces resource costs because no proxy is required.
- A X-Engine Edition cluster provides a primary node and multiple read-only nodes. The primary node processes
read and write requests. The cluster contains at least one read-only node. The cluster
supports the Dedicated and General-purpose specifications.
- Dedicated: Computing resources such as CPUs that are allocated to each cluster are exclusive to the cluster. This improves the stability and reliability.
- General-purpose: Idle computing resources such as CPUs are shared among clusters on the same server for cost-effectiveness.
Specifications of compute nodes
| Edition | Node instance type | CPU and memory specification | Maximum storage capacity | Maximum number of connections | Maximum number of inodes in a file system1 | Maximum number of blktags in a file system2 | Internal bandwidth | Maximum IOPS of PSL4 | Maximum IOPS of PSL5 | I/O bandwidth |
|---|---|---|---|---|---|---|---|---|---|---|
| Multi-master Cluster (Database/Table) Edition (Dedicated) | polar.mysql.mmx4.xlarge | 8 cores, 32 GB memory | 20 TB | 10,000 | 4,194,304 | 5,242,880 | 10 Gbps | 48,000 | 96,000 | 8 Gbps |
| polar.mysql.mmx8.xlarge | 8 cores, 64 GB memory | 30 TB | 16,000 | 6,291,456 | 7,864,320 | 10 Gbps | 54,000 | 108,000 | 10 Gbps | |
| polar.mysql.mmx8.2xlarge | 16 cores, 128 GB memory | 100 TB | 32,000 | 20,971,520 | 26,214,400 | 10 Gbps | 96,000 | 192,000 | 16 Gbps | |
| polar.mysql.mmx8.4xlarge | 32 cores, 256 GB memory | 100 TB | 64,000 | 20,971,520 | 26,214,400 | 10 Gbps | 144,000 | 288,000 | 24 Gbps | |
| polar.mysql.mmx8.8xlarge | 64 cores, 512 GB memory | 100 TB | 64,000 | 20,971,520 | 26,214,400 | 10 Gbps | 144,000 | 288,000 | 24 Gbps | |
| polar.mysql.mmx8.12xlarge | 88 cores, 710 GB memory | 100 TB | 100,000 | 20,971,520 | 26,214,400 | 25 Gbps | 192,000 | 384,000 | 32 Gbps | |
| Multi-master Cluster (Database/Table) Edition (General-purpose) | polar.mysql.mmg2.xlarge | 8 cores, 16 GB memory | 10 TB | 6,000 | 2,097,152 | 2,621,440 | 10 Gbps | 18,000 | 36,000 | 2 Gbps |
| polar.mysql.mmg4.xlarge | 8 cores, 32 GB memory | 20 TB | 10,000 | 4,194,304 | 5,242,880 | 10 Gbps | 27,000 | 54,000 | 4 Gbps | |
| polar.mysql.mmg4.2xlarge | 16 cores, 64 GB memory | 30 TB | 16,000 | 6,291,456 | 7,864,320 | 10 Gbps | 31,500 | 63,000 | 4 Gbps | |
| polar.mysql.mmg4.4xlarge | 32 cores, 128 GB memory | 60 TB | 32,000 | 12,582,912 | 15,728,640 | 10 Gbps | 63,000 | 126,000 | 8 Gbps | |
| Cluster Edition (Dedicated) | polar.mysql.x4.medium | 2 cores, 8 GB memory | 5 TB | 6,000 | 1,048,576 | 1,310,720 | 1 Gbps | 6,000 | 12,000 | 1 Gbps |
| polar.mysql.x8.medium | 2 cores, 16 GB memory | 10 TB | 8000 | 2,097,152 | 2,621,440 | 10 Gbps | 13,500 | 27,000 | 2 Gbps | |
| polar.mysql.x4.large | 4 cores, 16 GB memory | 10 TB | 8,000 | 2,097,152 | 2,621,440 | 10 Gbps | 24,000 | 48,000 | 4 Gbps | |
| polar.mysql.x8.large | 4 cores, 32 GB memory | 10 TB | 8000 | 2,097,152 | 2,621,440 | 10 Gbps | 27,000 | 54,000 | 4 Gbps | |
| polar.mysql.x4.xlarge | 8 cores, 32 GB memory | 20 TB | 10,000 | 4,194,304 | 5,242,880 | 10 Gbps | 48,000 | 96,000 | 8 Gbps | |
| polar.mysql.x8.xlarge | 8 cores, 64 GB memory | 30 TB | 16,000 | 6,291,456 | 7,864,320 | 10 Gbps | 54,000 | 108,000 | 10 Gbps | |
| polar.mysql.x4.2xlarge | 16 cores, 64 GB memory | 100 TB | 32,000 | 20,971,520 | 26,214,400 | 10 Gbps | 96,000 | 192,000 | 16 Gbps | |
| polar.mysql.x8.2xlarge | 16 cores, 128 GB memory | 100 TB | 32,000 | 20,971,520 | 26,214,400 | 10 Gbps | 96,000 | 192,000 | 16 Gbps | |
| polar.mysql.x4.4xlarge | 32 cores, 128 GB memory | 100 TB | 64,000 | 20,971,520 | 26,214,400 | 10 Gbps | 144,000 | 288,000 | 10 Gbps | |
| polar.mysql.x8.4xlarge | 32 cores, 256 GB memory | 100 TB | 64,000 | 20,971,520 | 26,214,400 | 10 Gbps | 144,000 | 288,000 | 24 Gbps | |
| polar.mysql.x8.8xlarge | 64 cores, 512 GB memory | 100 TB | 64,000 | 20,971,520 | 26,214,400 | 10 Gbps | 144,000 | 288,000 | 24 Gbps | |
| polar.mysql.x8.12xlarge | 88 cores, 710 GB memory | 100 TB | 100,000 | 20,971,520 | 26,214,400 | 25 Gbps | 192,000 | 384,000 | 32 Gbps | |
| Cluster Edition (General-purpose) | polar.mysql.g2.medium | 2 cores, 4 GB memory | 5 TB | 1,800 | 1,048,576 | 1,310,720 | 1 Gbps | 3,000 | 6,000 | 1 Gbps |
| polar.mysql.g4.medium | 2 cores, 8 GB memory | 5 TB | 2,000 | 1,048,576 | 1,310,720 | 1 Gbps | 6,000 | 12,000 | 1 Gbps | |
| polar.mysql.g2.large | 4 cores, 8 GB memory | 10 TB | 3,000 | 2,097,152 | 2,621,440 | 10 Gbps | 11,250 | 22,500 | 2 Gbps | |
| polar.mysql.g4.large | 4 cores, 16 GB memory | 10 TB | 6,000 | 2,097,152 | 2,621,440 | 10 Gbps | 15,750 | 31,500 | 2 Gbps | |
| polar.mysql.g2.xlarge | 8 cores, 16 GB memory | 10 TB | 6,000 | 2,097,152 | 2,621,440 | 10 Gbps | 18,000 | 36,000 | 2 Gbps | |
| polar.mysql.g4.xlarge | 8 cores, 32 GB memory | 20 TB | 10,000 | 4,194,304 | 5,242,880 | 10 Gbps | 27,000 | 54,000 | 4 Gbps | |
| polar.mysql.g4.2xlarge | 16 cores, 64 GB memory | 30 TB | 16,000 | 6,291,456 | 7,864,320 | 10 Gbps | 31,500 | 63,000 | 4 Gbps | |
| polar.mysql.g6.2xlarge | 16 cores, 96 GB memory | 30 TB | 16,000 | 6,291,456 | 7,864,320 | 10 Gbps | 31,500 | 63,000 | 8 Gbps | |
| polar.mysql.g8.2xlarge | 16 cores, 128 GB memory | 30 TB | 16,000 | 6,291,456 | 7,864,320 | 10 Gbps | 31,500 | 63,000 | 8 Gbps | |
| polar.mysql.g4.4xlarge | 32 cores, 128 GB memory | 100 TB | 32,000 | 20,971,520 | 26,214,400 | 10 Gbps | 42,000 | 84,000 | 8 Gbps | |
| Single Node Edition | polar.mysql.s2.large | 4 cores, 8 GB memory | 5 TB | 6,000 | 1,048,576 | 1,310,720 | 1 Gbps | 8,000 | 16,000 | 1 Gbps |
| X-Engine Edition (Dedicated) | polar.mysql.ax4.large | 4 cores, 16 GB memory | 200 TB | 8,000 | 41,943,040 | 52,428,800 | 10 Gbps | 24,000 | 48,000 | 4 Gbps |
| polar.mysql.ax4.xlarge | 8 cores, 32 GB memory | 200 TB | 10,000 | 41,943,040 | 52,428,800 | 10 Gbps | 48,000 | 96,000 | 8 Gbps | |
| polar.mysql.ax8.xlarge | 8 cores, 64 GB memory | 200 TB | 16,000 | 41,943,040 | 52,428,800 | 10 Gbps | 54,000 | 108,000 | 10 Gbps | |
| polar.mysql.ax8.2xlarge | 16 cores, 128 GB memory | 200 TB | 32,000 | 41,943,040 | 52,428,800 | 10 Gbps | 96,000 | 192,000 | 16 Gbps | |
| polar.mysql.ax8.4xlarge | 32 cores, 256 GB memory | 200 TB | 64,000 | 41,943,040 | 52,428,800 | 10 Gbps | 144,000 | 288,000 | 24 Gbps | |
| polar.mysql.ax8.8xlarge | 64 cores, 512 GB memory | 200 TB | 64,000 | 41,943,040 | 52,428,800 | 10 Gbps | 144,000 | 288,000 | 24 Gbps | |
| polar.mysql.ax8.12xlarge | 88 cores, 710 GB memory | 200 TB | 100,000 | 41,943,040 | 52,428,800 | 25 Gbps | 192,000 | 384,000 | 32 Gbps | |
| X-Engine Edition (General-purpose) | polar.mysql.ag2.large | 4 cores, 8 GB memory | 200 TB | 3,000 | 41,943,040 | 52,428,800 | 10 Gbps | 11,250 | 22,500 | 2 Gbps |
| polar.mysql.ag4.large | 4 cores, 16 GB memory | 200 TB | 6,000 | 41,943,040 | 52,428,800 | 10 Gbps | 15,750 | 31,500 | 2 Gbps | |
| polar.mysql.ag2.xlarge | 8 cores, 16 GB memory | 200 TB | 6,000 | 41,943,040 | 52,428,800 | 10 Gbps | 18,000 | 36,000 | 2 Gbps | |
| polar.mysql.ag4.xlarge | 8 cores, 32 GB memory | 200 TB | 10,000 | 41,943,040 | 52,428,800 | 10 Gbps | 27,000 | 54,000 | 4 Gbps | |
| polar.mysql.ag4.2xlarge | 16 cores, 64 GB memory | 200 TB | 16,000 | 41,943,040 | 52,428,800 | 10 Gbps | 31,500 | 63,000 | 4 Gbps | |
| polar.mysql.ag4.4xlarge | 32 cores, 128 GB memory | 200 TB | 32,000 | 41,943,040 | 52,428,800 | 10 Gbps | 63,000 | 126,000 | 8 Gbps |
Maximum number of inodes in a file system1 and maximum number of blktags in a file system2:
- PolarDB uses the self-developed distributed file system of Polar File System (PolarFS) to access underlying storage. Similar to traditional file systems, PolarFS contains inodes and blktags. An inode corresponds to a file. A blktag corresponds to a 4 MB logical space on Elastic Block Storage (EBS). The numbers of inodes and blktags are linearly related to the storage capacity. For example, a 10 TB disk has a maximum of 2,048,000 inodes and 2,560,000 blktags. If the maximum capacity, maximum number of inodes, or maximum number of blktags is reached, you must upgrade the specifications.
- Conversion of capacity units:
- 1 TB=1,000 GB
- 1 GB=1,024 MB
- 1 MB=1,024 KB
- 1 KB=1,024 Byte
Note
- The maximum IOPS is a theoretical value.
- A PolarDB cluster that has 2 CPU cores and 8 GB of memory is sufficient to provide the basic specifications required in tests, trials, and other light-load scenarios. We recommend that you do not use clusters of these specifications in heavy-load production environments. In production environments, we recommend that you use clusters that have at least 8 CPU cores and 32 GB of memory.
- Clusters in a global database network (GDN) do not support specifications of 2 cores and 4 GB of memory or 2 cores and 8 GB of memory.
- You can specify the specifications of the primary node when you create a Cluster Edition Edition cluster. The same node specifications are automatically applied to read-only nodes.
- The maximum number of connections for a cluster varies based on the node specifications of the cluster. If you add nodes to a cluster, the number of connections to the cluster remains unchanged.