Unable to Achieve Gigabit Transfer Speeds (Storage Related)

James Snyder · Jun 27, 2016

I just put together an Ubuntu server for basic file storage / sharing, but when attempting to move data between the two machines I can only achieve a 15MB/s data transfer rate.

I've got my personal Windows machine and server connected to a TL-SG1008D gigabit switch via Cat6 cables, and both onboard ports are rated for 10/100/1000.

The Windows machine uses a Sandisk Ultra II and the server uses two 1TB Western Digital Blacks running in RAID 0 (just playing around right now so I'm not worried about RAID failure).

I've run an IPERF test between the two machines and the end result was 1.10 GBytes 942 Mbits/sec - so this might be a Windows / storage media issue.

I'm unsure where the bottleneck is - any ideas?

weberdarren97 · Jun 27, 2016

The bottleneck is probably in your HDD, since it's a mechanical drive.

why_wolf · Jun 27, 2016

If possible trying moving some files off a USB stick onto your server and see what the transfer speed is doing that. If its still slow than that means something is up with either your RAID or the drives themselves.

James Snyder · Jun 27, 2016

why_wolf :

Ran hdparm for both drives in the server - everything seems to check out.

/dev/sda:
Timing cached reads: 9400 MB in 2.00 seconds = 4702.67 MB/sec
Timing buffered disk reads: 550 MB in 3.01 seconds = 182.83 MB/sec
james@Moonunit:~$ sudo hdparm -tT /dev/sdb

/dev/sdb:
Timing cached reads: 9530 MB in 2.00 seconds = 4768.41 MB/sec
Timing buffered disk reads: 538 MB in 3.01 seconds = 178.82 MB/sec

Not 100% on how I'd observe transfer speeds when moving files off attached drives.

Forgot to mention that the two WD Blacks in the server are both brand new.

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Unable to Achieve Gigabit Transfer Speeds (Storage Related)

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