This fix my problem. Add deadline i/o sheduler for non rotating disks
(in my case usb pen)
sudo nano /etc/udev/rules.d/60-schedulers.rules
and paste these
# set cfq scheduler for rotating disks
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1",
ATTR{queue/scheduler}="cfq"
# set deadline scheduler for non-rotating disks
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0",
ATTR{queue/scheduler}="deadline"
before change i has
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1",
ATTR{queue/scheduler}="cfq"
i don't know why. By default form ubuntu 14.4 io sheduler miust be deadline by
default
https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes/14.04
but may be is not :)
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https://bugs.launchpad.net/bugs/1208993
Title:
Ubuntu slows down and hangs while copying file from/to USB
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