Purchase cloud disks

Last Updated: Aug 03, 2017

Cloud disks on ECS instances are classified into system disks and data disks by usage. System disks and data disks may be of any disk type. For details about the differences among various disk types, refer to Disk categories and application scenarios in the Product Overview of ECS. For details about the disk types supported by different instance types, refer to Instance generations and type families.

You can purchase system disks and data disks for your ECS instances.

Purchase methods

The method for buying disks varies depending on the specific disk usage.

Purchase system disks

You can purchase system disks only when you are creating an ECS instance. By default, the minimum disk capacity is 40 GB and the maximum is 500 GB.

Purchase data disks

An account can have a maximum of 250 data disks, and a maximum of 16 data disks can be attached to one ECS instance.

The disk capacity varies depending on different disk types.

  • SSD cloud disks and ultra cloud disks: By default, the minimum disk capacity is 20 GB and the maximum is 32,768 GB.
  • Basic cloud disk: By default, the minimum disk capacity is 20 GB and the maximum is 2,048 GB.

You can purchase a data disk by using either of the following methods:

  • Purchasing a data disk when creating an ECS instance.

    Note: Data disks created by using this method cannot be detached but are released along with the ECS instance.

  • Creating a cloud disk independently in the ECS console.

    Note: Data disks created by using this method can be detached but are not by default released along with the ECS instance.

Pricing and billing

Disk prices are classified into:

  • Monthly price: Applicable in prepayment mode, that is, pay first and use later
  • Pay-As-You-Go price: Applicable in post-payment mode, that is, use first and pay later

The disk price varies depending on different regions. For pricing details, refer to Pricing.

The billing method for a disk is related to the method that is used to create the disk and the billing method for the ECS instance to which the disk is attached. For details, see the following table.

Disk creation method Billing methods for ECS instances Billing method for system disks Billing method for data disks
The disk is created when you are creating an ECS instance. Subscription The disk is billed on a monthly basis. The billing unit is USD/40 GB/month. The disk is billed on a monthly basis. The billing unit is USD/GB/month.
Pay-As-You-Go The disk is billed for the actual usage on an hourly basis. The billing unit is USD/40 GB/hour. The charge for usage less than 1 hour is calculated based on 1 hour. The disk is billed for the actual usage on an hourly basis. The billing unit is USD/GB/hour.
The disk is created independently. The billing method of instances has no effect on the billing method for disks. System disks cannot be created independently. Cloud disks can be created independently in the ECS console. The disk is billed for the actual usage. The billing unit is USD/GB/hour.

Example of charge calculation: Suppose you purchase two 40 GB ultra cloud disks as a system disk and a data disk in a mainland China region. The cost varies depending on the methods used to create disks and/or the billing method for ECS instances. See the following table for details.

  • System disk

    Billing method for disks Billing method for ECS instances Billing period Price Cost
    Subscription (monthly basis) Subscription (monthly basis) From 12:25:34, Mar. 12, 2017 to 00:00:00, Apr. 13, 2017, one month US$3.08/40GB/month US$3.08
    Pay-As-You-Go Pay-As-You-Go From 12:25:34 to 13:00:00, Mar. 12, 2017, one hour US$0.008/40GB/hour US$0.008
  • Data disk

    Billing method for disks Billing period Price Cost
    Subscription (monthly basis) From 12:25:34, Mar. 12, 2017 to 00:00:00, Apr. 13, 2017, one month US$0.08/GB/month US$3.20
    Pay-As-You-Go From 12:25:34 to 13:00:00, Mar. 12, 2017, one hour US$0.0002/GB/hour US$0.008

Payment options

You can use credit cards, PayPal, or coupon to pay for disks.

  • Fees for a disk created along with an ECS instance are settled at the instance settlement time. Fees for independently created data disks are settled separately.

  • Disks priced in Pay-As-You-Go mode adopt post payment. For details about the settlement rules, refer to the Pay-As-You-Go billing rules. You can go to Billing Management > Bills Details > Postpaid Billing to view the disk fee record.

  • Disks with a monthly price adopt prepayment. For details about the settlement rules, refer to the Subscription billing rules. You can go to Billing Management > Bills Details > Prepaid Billing to view the disk fee record.

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