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ESXi 6.5 very slow 10Gb iSCSI write perfomance

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Hello

 

Connect to the target via 10Gb links.
Standard switches have been created.
The target is based on SSDs.

The latest patches are installed.

Tried various MPIO settings

 

When testing 4K blocks shows an incredible reading speed - 3 GByte per second.
When testing 4K blocks shows a very small read speed - 1 MB per second.

 

When testing 64K blocks shows an incredible reading speed - 3-3.5 GByte per second.
When testing 64K blocks shows a very small read speed - 19 MB per second.

 

When connecting to the same target from Windows OS:

 

When testing 4K blocks shows a good reading speed - 1.4 GByte per second.
When testing 4K blocks shows a good write speed - 1 GByte per second.

 

When testing 64K blocks shows good reading speed - 1.8 GByte per second.
When testing 64K blocks shows good write speed - 1.2 GByte per second.

 

What could be the problem?


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