Hello guys, does anyone knows the maximum transfer rate supported by our awesome Udoo? Does it makes sense to buy a class 10 or even a UHS-I sd card to speed up disk I\O? Also regarding the SD Card, is the 8Gb limit given by the documentation an hardware limit or only a matter of partition / allocated space by default system images on the device? Cheers!
I don't recall anyone doing any benchmarking on the UDOO of the SD possibilities but people are using UHS-I 30Mbs cards - at what throughput I don't know. The 8GB 'limit' isn't a limit - it's a side effect of the UDOO supplied images being 8GB in size. Therefore putting an 8GB image on a 16GB card is fine, but only half the capacity would be used. It is well documented on these forums how to put an 8GB image on a larger card, and then resize it to take advantage of the extra room. Of course those who want/need/desire extra room would probably use the SATA capabilities.
Thank you very much! I'll search for a good deal and make some speed test. Meanwhile a sata hdd from an old laptop is waiting for the power cable on my desk
Here's some benchmark I've done: board: Udoo Quad o.s.: Ubuntu 13.10 fresh install sd card: Kingston 4gb class 4 (cheap 3-5€) Code: udoo-quad setola # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 13.10 Release: 13.10 Codename: saucy udoo-quad setola # uname -a Linux udoo-quad 3.0.35 #5 SMP PREEMPT Mon Nov 11 14:45:12 CET 2013 armv7l armv7l armv7l GNU/Linux Code: udoo-quad setola # hdparm -Tt /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 724 MB in 2.00 seconds = 361.88 MB/sec Timing buffered disk reads: 58 MB in 3.04 seconds = 19.08 MB/sec Code: udoo-quad setola # dd count=1k bs=1M if=/dev/zero of=/tmp/asd 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 405.912 s, 2.6 MB/s I normally trust only dd, so the real write speed for me is 2.6MB/s, which should be half of the maximum declared by the manufacturer. This SD is cheap and can be found on every tech shop, but, for example, when I had to install some packages, it took a very long time to unpack it.
Very useful info, thank you. At that price, cheap though it is, worth going for a branded Class 10 UHS-I (rated for 30 MB/s sequential read) as they are only £4.45 (inc delivery from Hong Kong) which is just over €5/$7.50 (those were Toshiba's).
Another SD: Sony UHS-I 8GB, something around 13€ Code: udoo-quad setola # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 13.10 Release: 13.10 Codename: saucy Code: udoo-quad setola # hdparm -Tt /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 718 MB in 2.00 seconds = 359.01 MB/sec Timing buffered disk reads: 58 MB in 3.10 seconds = 18.68 MB/sec Code: udoo-quad setola # dd count=1k bs=1M if=/dev/zero of=/tmp/asd 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 146.359 s, 7.3 MB/s I think thouse 10€ were a good deal to improve the performances. The feeling with apt-get install is really better than the cheap kingston.
Finally I've got an old hdd up and ready: Hitachi 500GB SATA 3.0Gb\s Code: udoo-quad ~ # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 13.10 Release: 13.10 Codename: saucy Code: udoo-quad ~ # hdparm -Tt /dev/sda1 /dev/sda1: Timing cached reads: 734 MB in 2.00 seconds = 366.46 MB/sec Timing buffered disk reads: 238 MB in 3.02 seconds = 78.71 MB/sec Code: udoo-quad ~ # dd count=1k bs=1M if=/dev/zero of=/tmp/asd 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 29.562 s, 36.3 MB/s Obviously an hdd overcome the sd by far
