HARDKERNEL ODROID-XU4, Руководство пользователя

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ODROID-XU4 USER MANUAL
“xu4-01-raid1”. The XU4 sees the enclosure setup as just one drive
called RAID1. Power off the entire setup and power them back up,
then run the following command in order to validate the setup:
$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 746M 0 746M 0% /dev
tmpfs 200M 6.8M 193M 4% /run
/dev/mmcblk0p2 15G 3.8G 10G 28% /
tmpfs 998M 88K 998M 1% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 998M 0 998M 0% /sys/fs/cgroup
/dev/mmcblk0p1 128M 7.1M 121M 6% /media/boot
cgmfs 100K 0 100K 0% /run/cgmanager/fs
tmpfs 200M 20K 200M 1% /run/user/1000
/dev/sda1 237G 63M 225G 1% /media/odroid/xu4-01-raid1
Note that the file-system entry of /dev/sda1 is the same as the
entry for the HDD storage device used in the official Hardkernel dock-
ing system kit described in the previous section. No two entries can
actually have the same filesystem names. They are the same here
since these sections were written with only one external storage de-
vice attached at a time. These kits and enclosures can used at the
same time provided that they use their own power supplies, since the
XU4 cannot deliver the high power requirements through the on-board
USB3 ports. They will have different device names if used simultane-
ously.
Since the RAID1 functionality is provided by the hardware in the
enclosure, the disk access speeds under optimal test conditions are
quite reasonable:
$ sudo hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 296 MB in 3.01 seconds = 98.33 MB/sec
odroid@xu4-2:~$ sudo hdparm -T /dev/sda1
/dev/sda1:
Timing cached reads: 1724 MB in 2.00 seconds = 863.05 MB/sec
The actual performance speeds may vary based on your setup.
USB GPS Module
Hardkernel produces a 5V/0.1A GPS receiver with an USB in-
terface that supports the standard National Marine Electronics Asso-
ciation (NMEA) GPS protocol, as shown below. The device uses the
Ublox 6010 chipset, with support already built into the official Hard-
kernel Ubuntu image. One should be able to attach the device to an
available USB port on the XU4 and start using it right away.
Chapter 4