System works more or less fine, but stucks from time to time. I've tried to detect using
iotop it and it seems that disk io is the bottleneck.
jbd2 keep writing to disk all the time, but load not more than 5-15% of IO
From time to time (more than once an hour) processes with names like
--render-print-preview .. or
--extension .. or
dropbox \fataldb or
chrome --no-startup-window load > 99% of IO for a few seconds and during that time system is totally unresponsive - it just stucks so hard that I can't even open console and tty1 (Ctr-Alt-1) .
Any ideas of why it can behave like this? Thanks.
update: it seem that those 99% load is 3-5Mb/s that seems quite little. However, tests like
dd -if=/dev/sda -of=/dev/null show read speed at about 70Mb/s - and that's normal. May be the thing is that they are sequential.