LSI HBA : 6 3TB Disks : Transfer rate over SMB start 100Mb drops to 50MB

[Jangle]

I am trying to work out why my transfer speed drops when copying a file from Unraid 6.11.1 over SMB to a windows machine.

 

I have all drives now connected using a LSI HBA not direct motherboard.

 

My switch communiction is 1G full duplex witha high backplane.

[JorgeB]

That's normal if you are transferring to the array with the default write mode, try turbo write.

[Jangle]

I already have turbo write turned on, and there is a cache drive in between.

 

But still weird speed service delivery.

[JorgeB]

Please post diags during a transfer.

[Frank1940]

On 10/14/2022 at 10:59 AM, Jangle said:

I am trying to work out why my transfer speed drops when copying a file from Unraid 6.11.1 over SMB to a windows machine.

 

Your problem is occurring during a transfer of a single file from your server?  Or is it slowly down while copying a file which is a part of a batch file transfer?  How big is the file? 

 

19 hours ago, Jangle said:

I already have turbo write turned on, and there is a cache drive in between.

 

Turbo write (off or on) will not effect the transfer of a file from your server!    Where is this cache drive?  I would assume that it is on your Unraid server.   

 

What is the reduction in speed?   Is the target hard drive on the Windows CMR or SMR?   How much RAM does your Windows computer have?  (There are many steps/components involved in writing a file to a disk in any modern OS...)