Why Is the Linux Block-Level Migration Very Slow?
Symptom
During a Linux block-level migration, you found that the actual migration rate was far lower than the bandwidth limit I have configured.
Possible Causes
The possible causes are as follows:
- A small amount of data is stored in disk blocks.
- A large number of sparse files are stored in source disks.
In a Linux block-level migration, data is compressed before being transmitted. If the disk blocks to be migrated store a small amount of data or are empty, the data compression rate is high, for example, 100 MB of data is compressed to 5 MB. In this case, the displayed migration rate will be very low. But actually, the migration is still performed quickly, and the network connection and bandwidth are normal.
Migration Duration FAQs
- How Long Does a Migration Take?
- How Do I View the Remaining Migration Time?
- How Is the Migration Rate Displayed on the SMS Console Calculated?
- How Do I Speed Up Migration?
- Why Does the Migration Speed Fluctuate?
- How Do I Test the Network Between the Source and Target Servers Using iPerf?
- Why Isn't the Increased Bandwidth Being Used During the Migration?
- Is the Migration Speed Determined by the Source Bandwidth or the Target Bandwidth?
- Why Does the Migration Stay in a Stage for a Long Time?
- What Factors Affect the Migration Speed?
- Why Is the Linux Block-Level Migration Very Slow?
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