Elastic Compute Service:Disks

Item

ESSD AutoPL disk

ESSD

Standard SSD

Ultra disk

Basic disk

PL3

PL2

PL1

PL0

Capacity range per disk (GiB)

40~65,536

1261~65,536

461~65,536

20~65,536

20~65,536

20~32,768

20~32,768

5~2,000

Maximum IOPS

1,000,000

1,000,000

100,000

50,000

10,000

25,000

5,000

Several hundreds

Maximum throughput (MB/s)

4,096

4,000

750

350

180

300

140

30~40

Formula for calculating the IOPS per disk

• Baseline performance: min{1,800 + 50 × Capacity, 50,000}

• Provisioned performance: min{Provisioned IOPS, 50,000}

• Burst performance: min{IOPS supported by the instance type, 1,000,000}

min{1,800 + 50 × Capacity, 1,000,000}

min{1,800 + 50 × Capacity, 100,000}

min{1,800 + 50 × Capacity, 50,000}

min{1,800+12 × Capacity, 10,000}

min{1,800 + 30 × Capacity, 25,000}

min{1,800 + 8 × Capacity, 5,000}

None

Formula for calculating the throughput per disk (MB/s)

• Baseline performance: min{120 + 0.5 × Capacity, 350}

• Provisioned performance: min{16 KB × Provisioned IOPS/1,024, Maximum throughput per disk}

• Burst performance: min{Throughput supported by the instance type, 4 GB/s}

min{120 + 0.5 × Capacity, 4,000}

min{120 + 0.5 × Capacity, 750}

min{120 + 0.5 × Capacity, 350}

min{100 + 0.25 × Capacity, 180}

min{120 + 0.5 × Capacity, 300}

min{100 + 0.15 × Capacity, 140}

None

Average one-way random write latency in milliseconds (block size = 4 KB)

0.2

0.2

0.2

0.2

0.3~0.5

0.5~2

1~3

5~10

API parameter value

cloud_auto

cloud_essd

cloud_essd

cloud_essd

cloud_essd

cloud_ssd

cloud_efficiency

cloud

Item

Requirement or limit

Adjust the quota

Permissions to create pay-as-you-go disks

To create disks within the Chinese mainland, you must first complete real-name verification.

N/A

Maximum number of pay-as-you-go disks

You can view the resource quota in the ECS console. For more information, see View and increase resource quotas.

N/A

Maximum number of system disks on a single instance

1

N/A

Maximum number of data disks on a single instance

64

N/A

Capacity of all pay-as-you-go ultra disks within an account

You can view the resource quota in the ECS console. For more information, see View and increase resource quotas.

N/A

Capacity of all pay-as-you-go standard SSDs within an account

You can view the resource quota in the ECS console. For more information, see View and increase resource quotas.

N/A

Capacity of all pay-as-you-go enhanced SSDs (ESSDs) within an account

You can view the resource quota in the ECS console. For more information, see View and increase resource quotas.

N/A

Capacity of a single basic disk

5 GiB to 2,000 GiB

N/A

Capacity of a single standard SSD

20 GiB to 32,768 GiB

N/A

Capacity of a single ultra disk

20 GiB to 32,768 GiB

N/A

Capacity of a single ESSD

• PL0 ESSDs: 20 GiB to 65,536 GiB

• PL1 ESSDs: 20 GiB to 65,536 GiB

• PL2 ESSDs: 461 GiB to 65,536 GiB

• PL3 ESSDs: 1,261 GiB to 65,536 GiB

N/A

Capacity of a single ESSD AutoPL disk

40 GiB to 32,768 GiB

N/A

Capacity of a single local standard SSD

5 GiB to 800 GiB

N/A

Capacity of all local standard SSDs on an instance

1,024 GiB

N/A

Capacity of a single system disk

• Windows Server: 40 GiB to 2,048 GiB

• FreeBSD: 30 GiB to 2,048 GiB

• Linux distributions excluding CoreOS: 20 GiB to 2,048 GiB

N/A

Permissions to attach new local disks to instances that are equipped with local disks

New local disks cannot be attached to instances that are already equipped with local disks.

N/A

Permissions to change configurations of instances that are equipped with local disks

Only bandwidth configurations of instances that are equipped with local disks can be changed.

N/A

Mount points of system disks

/dev/vda

N/A

Mount points of data disks

/dev/vd[b-z]

N/A

Operation

References

Attach an idle pay-as-you-go disk to an ECS instance

1. Attach a data disk

2. Format the data disk based on the operating system. For more information, see the following topics:

   • Initialize a data disk that is larger than 2 TiB in size

   • Initialize a data disk whose size does not exceed 2 TiB on a Linux instance

   • Initialize a data disk up to 2 TiB in size on a Windows instance

Create and use a data disk

1. Create a disk

2. Attach a data disk

3. Format the data disk based on the operating system. For more information, see the following topics:

   • Initialize a data disk whose size does not exceed 2 TiB on a Linux instance

   • Initialize a data disk up to 2 TiB in size on a Windows instance

Encrypt data stored on a disk

For more information about encryption, see Encryption overview.

Resize a system disk or data disk

For more information about resizing, see Overview.

Replace the operating system of an instance

Replace the operating system of an instance

Back up data stored on a disk

• Create a snapshot for a disk

• Enable or disable an automatic snapshot policy

Restore a disk to its initial state

Re-initialize a system disk

Restore a disk to its state at a specific point in time

Roll back a disk by using a snapshot

Detach a damaged system disk from an instance and attach the disk back to the instance after the disk is repaired

Detach or attach a system disk

Release an instance but retain data stored on its system disk

• Detach or attach a system disk

• Release a disk

• Release a disk

Release a subscription disk that is no longer needed to reduce costs

1. Change the billing methods of a disk

2. Detach a data disk

3. Release a disk

Release a pay-as-you-go disk that is no longer needed to reduce costs

1. Detach a data disk

2. Release a disk