tatanka
Posts: 15
Joined: Fri Apr 12, 2013 11:03 pm

Booting from USB 3.0 Stick

Sat May 04, 2013 8:51 pm

Hi,

I have read that booting your Raspi from a USB 3.0, improves a lot the performance of the system.
It makes sense, since the write/read speed of a sd-card is 14.6 MB/s (Class 10) where a USB 3.0 is 2x , i.e. 30MB/s .

Anyone booting from a USB 3.0 stick can confirm this improvement?

Thanks

User avatar
Jessie
Posts: 1754
Joined: Fri Nov 04, 2011 7:40 pm
Location: C/S CO USA

Re: Booting from USB 3.0 Stick

Sun May 05, 2013 12:04 am

Booting from a USB 2.0 stick is usually considerably faster than SD. I've never tested a 3.0 stick in my pi, but considering they generally perform well even in a 2.0 port it would likely do well as a boot device. I doubt you would see more than 35 MBps.

tatanka
Posts: 15
Joined: Fri Apr 12, 2013 11:03 pm

Re: Booting from USB 3.0 Stick

Sun May 05, 2013 12:33 am

Raspberry Pi USB are 2.0 USB ports?
There is any advantage using a USB 3.0 stick on a 2.0 USB Port?

User avatar
Jessie
Posts: 1754
Joined: Fri Nov 04, 2011 7:40 pm
Location: C/S CO USA

Re: Booting from USB 3.0 Stick

Sun May 05, 2013 5:15 am

tatanka wrote:Raspberry Pi USB are 2.0 USB ports?
There is any advantage using a USB 3.0 stick on a 2.0 USB Port?
Yes they are 2.0 ports. In theory no you shouldn't see any advantage, however, many (but not all) USB 3.0 sticks are built with better components so they end up coming closer to saturating the USB 2.0 bus better or delivering better latency.

4thdwarflord
Posts: 142
Joined: Mon Dec 03, 2012 4:26 pm
Location: Deep in the mines of Moria

Re: Booting from USB 3.0 Stick

Wed May 08, 2013 4:17 pm

The SoC only knows to use the files from the SD card when booting. Do you mean putting the Ext4/Ext3 root file system on a usb stick?

jtb
Posts: 17
Joined: Sat Apr 27, 2013 2:07 pm

Re: Booting from USB 3.0 Stick

Wed May 08, 2013 7:07 pm

Just throw me out if I get obscene but that's the way that I've
always been
I think I know for certain

User avatar
Jessie
Posts: 1754
Joined: Fri Nov 04, 2011 7:40 pm
Location: C/S CO USA

Re: Booting from USB 3.0 Stick

Wed May 08, 2013 7:34 pm

4thdwarflord wrote:The SoC only knows to use the files from the SD card when booting. Do you mean putting the Ext4/Ext3 root file system on a usb stick?
Yes you copy the Linux partition to the USB stick and edit the config file on the SD card to read from the thumb drive. There is no way to get around having an SD card on a model b.

Return to “General discussion”