I don't know how to redirect with sudo.

I had to run:
sudo bash

this gave a root prompt, then I could run:
echo deadline > /sys/block/sda/queue/scheduler 

without running sudo again (running bash with sudo makes the prompt root
until you type exit).

I am curious about your fstab though, that was what really changed
things for me.

Also, to you have lots of small files or a few big ones?  I can try
testing.  It was primarily running updates, and the daily file indexing
that killed me.

-- 
Heavy Disk I/O harms desktop responsiveness
https://bugs.launchpad.net/bugs/131094
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