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
|
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?
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