Last updated：2020-10-30 18:15:34
This topic describes the limits on EBS usage.
|Item||Description||Method of extending the limit|
|Number of EBS volumes per KEC instance||A maximum of eight EBS volumes can be attached to each KEC instance.
A maximum of four EHDD volumes can be attached to each EPC instance.
|Submit a ticket.|
|Capacity of a single data disk||The capacity of a data disk of EBS 3.0 can be 10 GB to 32 TB.||Submit a ticket.|
|Capacity of a single system disk||The capacity of a system disk of EBS 3.0 can be changed.||Submit a ticket.|
|Daily purchasable quota in the EBS console||A maximum of 50 EBS volumes can be created per day.
The total capacity of EBS volumes created per day cannot exceed 50 TB.
|Submit a ticket.|
|Attachable KEC instances||EBS volumes and the KEC instances to which EBS volumes are attached must be in the same AZ.||None.|
|KEC instances supported by basic volumes||General Purpose N1, and I/O Optimized I2 and I3||None.|
|KEC instances supported by EHDD volumes||General Purpose N2 and N3, Performance Optimized X2, I/O Optimized I3, Standard S3, and all the fourth-generation KEC instances||None.|
|KEC instances supported by EBS 2.0||General Purpose N1 and I/O Optimized I2||None.|
|KEC instances supported by EBS 3.0||General Purpose N1, N2, and N3, I/O Optimized I2 and I3, Standard S3 and SA1, Performance Guaranteed X2, GPU Inference Computing P3I and P3IN, GPU General Compute P3 and P4V, Compute Optimized C3, Basic E1, ARM Computing AC1, and all the fourth-generation KEC instances||None.|
|Data centers where EHDD volumes are sold||cn_beijing_6c, cn_shanghai_2a, cn_shanghai_2b, cn_guangzhou_1a, cn_taipei_1a, and ap_singapore_1b||None.|
|Data centers where SSD volumes of EBS 3.0 are sold||cn_beijing_6a, cn_beijing_6b, cn_beijing_6c, cn_shanghai_2b, cn_guangzhou_1a, cn_taipei_1a, ap_singapore_1b, cn_beijing_fin, and cn_shanghai_fin||None.|
|Number of snapshots that can be created for an SSD volume of EBS 3.0||A maximum of seven snapshots can be created for an SSD volume.||Submit a ticket.|
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