Hi,

 

Wondering if anyone can help me with some transfer speeds as I am not sure things are running as quickly as they should?

 

I have tested by copying a 5GB file disk to disk using midnight commander & Krusader with the same results

 

5GB File -All start transferring at 500MB/s (Obviously writing to RAM) then gradually slow to 60MB/s 

 

The issue I have is that Disks 1-7 are all SATA3 Brand New Toshiba P300's and Diss 8-10 are 4 year old Samsung HD204UI's and if anything they are completing the 5GB transfer a few seconds faster!

 

The P300's & HD204UI are all on SATA2 & SATA3 ports (Mixed on-board & PCI-E SATA Controller Card & when checking the disk info the P300's are showing current 6GB Connection and the HD204UI's are showing current 3GB connection so curious as to know why the transfer rates are the same, surely the 7 brand new Toshiba P300's on a SATA3 connection should be a vast improvement?

 

I have attached my diagnostics file if any help.

 

Thanks in advance

 

 

 

 

unraidserver-diagnostics-20170925-2339.zip

6 minutes ago, mbc0 said:

surely the 7 brand new Toshiba P300's on a SATA3 connection should be a vast improvement?

 

SATA2 vs SATA3 won't make a difference with HDDs, but speed should improve some if/when you also replace parity with a similar disk, current parity is WD green with similar speeds to the Samsungs, so you can't take advantage of the Toshibas higher speed.

The WD Green is SATA3 but does that still have similar speed to the old SATA2 Samsungs?

 

So Parity is still written to when carrying out disk to disk transfers then.... 

 

I will run without parity tonight and rebuild using one of the Toshiba's!

 

Thank you

 

No current HDD can exceed SATA2 speeds during sustained transfers, speeds are mostly a result of the disk's rpms and number of plates, search for the diskspeed plugin, it will give you a graphical display of your disks speeds.

So is it worth changing my Parity disk for one of the Toshiba's then?

You should see a small improvement, but don't expect a lot, IIRC I got about 75MB/s sustained with the same disks, you'll get more with turbo write (copying from other computer, not so much disk to disk)

OK, an improvement is an improvenment from where I stand :-) how do I enable Turbo write (if it is not already enabled)

 

Thanks for all your messages johnnie :-)

Interesting results (especially the Cache drive drop off!) 

 

Thanks for your time, I am changing my Parity to one of the Toshiba's now... 

 

:-)

 

 

7 hours ago, mbc0 said:

how do I enable Turbo write (if it is not already enabled)