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Copying from SSD cache to USB3 slower than 1GB network from 2.5" array


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Copying over the 1GB network from the array (normal 2.5" drives) of server 1 to a windows PC with SSD with 1 1GB switch inbetween reaches the 100+ MB/s - OK.

Copying from the SSD cache from server 1 to the attached (unassigned device) USB3 disk only reaches 25 MB/s - NOK!

Copying from server 2 to the same USB3 disk does reach 100+ MB/s, so the USB3 disk is not the bottleneck.

 

So why is copying from the SSD cache only 25% of the array speed, where reading from the cache is much faster than from the array?

 

Edited by gerard6110
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