Usb speed

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Hi, i plan to use my banana pi as nas, but the usb speed is poor: only 13MB/s down to 8MB/s after 30 seconds. I tried via samba or ftp, both the same. 7sb drive was a usb 3.0 stick (Windows speed 90MB/s) and a hard drive, both ext3. Ntfs is only a little bit slower. With dd i can reach 14MB/s.
Any idea why it is that slow?
maybe you can change to ext4 to get faster.
(Reference the thread #18)

In addition, A20 chip and BPi support USB 2.0.
USB + HDD + Ext4
$ sudo hdparm -Tt /dev/sdb
Timing cached reads:   550 MB in  2.01 seconds = 274.27 MB/sec
Timing buffered disk reads:  62 MB in  3.07 seconds =  20.16 MB/sec

Reply 2# Raymond

I changed to ext4, it's only half a MByte faster. If i use hdparm i also get 20 MBytes, but with dd the same as via ftp.......
This for hard drive or the stick, so it should not be related to the stick itself. Also between hdparm and ftp is a huge loss of speed....

"hdparm -tT" is only testing the readingspeed
dd is giving us the writingspeed

Try another sd card

Reply 5# daristan

sd card is used for buffering?
The stick gives 90MByte on USB3 Windows PC

My os is lubuntu 3.0, hardisk 1tb ext4 , install samba without changing any setting I can achieve up 24mb/s transfer rate constantly in lan. If you cannot achieve it, try a different sd card, lan cable, usb cable and hard drive to see which is faulty. I remember when I run raspian os with another card I also achieve less than 10mb/s before.

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