Bananian

Using SATA Multiplier

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tkaiser  
Panda_92 replied at Tue Feb 17, 2015 12:42
I get this error message running iozoneo I need to expand the SD Card?

Edit: On the HDD is enough ...

By default iozone is always testing in the current working directory. So you've to 'cd /media/C212DC4112DC3BDB' before. And yes, the CRC error count is ok. But since the dmesg output showed negotiation with just SATA 1.0 (1.5 Gbps -- not that important when it's about disks with slow sequential transfer rates but it's strange since the disk is capable of SATA 3.0/6Gbps) and multiple hard resets of the link it's always better to double check than to trust that everything's ok.

Hey Kaiser,

Here the results of benchmark test.
ca. 5-10 min cool down in between.

HD1:

  1.               KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
  2.          2048000       4    6989    9021    59976    60307                     
Copy the Code
HD2:

  1.               KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
  2.          2048000       4    6869    9105    59326    58612
Copy the Code
HD3:
  1.               KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
  2.          2048000       4    5508    8602    55432    55002
Copy the Code
HD4:
  1.               KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
  2.          2048000       4    6378    7808    60584    60850
Copy the Code
HD5:
  1. KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
  2.          2048000       4    7378    9403    60775    58910
Copy the Code
A little bit slow isn't it?

Kind Regards
Panda_92

tkaiser  
Edited by tkaiser at Thu Feb 19, 2015 03:15
Panda_92 replied at Wed Feb 18, 2015 13:44
Here the results of benchmark test.


Way too slow. There's something going wrong.

Edited by Panda_92 at Thu Feb 19, 2015 09:10

I also made a iozone Test using USB instead of SATA, the results are similar. So I think the cable is not the problem...

tkaiser  
Edited by tkaiser at Sat Feb 21, 2015 08:57
Panda_92 replied at Thu Feb 19, 2015 09:10
I also made a iozone Test using USB instead of SATA, the results are similar. So I think the cable i ...


Similar results with USB 2.0? You get read throughput exceeding ~35 MB/s? If you're talking about slow write performance I've no idea what's going on.

The performance of disk access is affected by many factors (CPU and DRAM clock frequency, kernel config, filesystem settings, partition layout and so on) that it's hard to get a clue why you get only 25%-30% of the maximum throughput already measured between SATA disks and A20 SoC without knowing anything about your installation. In case you're only testing against your Lian Li enclosure I would suggest using another single disk to nail the problem down.

Or did you setup a RAID and test against that currently?

I though the problem could be the sata cable, but resulting the low speed of the usb 2 test I think the problem could be another one. I willl try to make a single test, if I get the hardware. There is no RAID installed.

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