Help Center/ Server Migration Service/ FAQs/ Product Consultation/ How Many Resources Will Be Used for a Linux Block-Level Migration?
Updated on 2024-08-31 GMT+08:00
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How Many Resources Will Be Used for a Linux Block-Level Migration?

Memory Usage (of Data Cache)

There are six data cache nodes configured by the Agent on a source server. The default size of a single cache node is 4 MB.

  • Minimum memory occupied by data cache: 6 x 1 MB = 6 MB
  • Default memory occupied by data cache: 6 x 4 MB = 24 MB
  • Maximum memory occupied by data cache: 6 x 8 MB = 48 MB

CPU Usage

The following table describes how much CPU resource is used by a Linux block-level migration.

Number of CPUs

CPU Usage

Before the Agent Starts (n)

Default Compression Threads

Configured by the Agent

CPU Usage

After the Agent Starts

1

-

0. Data is not compressed.

< n + 10%

2

n ≥ 50%

0. Data is not compressed.

< n + 10%

2

n < 50%

1

< n + 50%

4

n ≥ 75%

0. Data is not compressed.

< n + 4%

4

50% ≤ = n ≤ 75%

1

< n + 25%

4

25% ≤ n < 50%

2

< n + 50%

4

n < 25%

3

< n + 75%

8

n ≥ 87%

0. Data is not compressed.

< n + 3%

8

75% ≤ n < 87%

1

< n + 13%

8

62% ≤ n < 75%

2

< n + 25%

8

n < 62%

3

< n + 38%

16

n ≥ 93%

0. Data is not compressed.

< n + 1%

16

87% ≤ n < 93%

1

< n + 6%

16

82% ≤ n < 87%

2

< n + 13%

16

n < 82%

3

< n + 17%

≥ 32

-

3

< n + 10%
  • If the number of compression threads is larger than 0, the CPU usage after the Agent starts can be calculated as follows:

    in which, c indicates the number of CPUs, p indicates the number of compression threads, and n indicates the CPU usage before the Agent starts.

  • If the number of compression threads is 0, the Agent occupies less than 10% of the CPU capacity. The formula for calculating the CPU usage is as follows:

    By default, data compression is enabled for Linux block-level migrations. To disable this function, see, see How Do I Disable Data Compression When the CPU Usage Is Too High During a Linux Block-level Migration?

Parent topic: Product Consultation