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[Ivan Baldo <ibaldo@xxxxxxxxxxxxx>]

BTW, that IBM article... it doesn't mention what versions they used,
which I think is very important :-(.

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https://bugs.launchpad.net/bugs/1008400

Title:
  Ubuntu server uses CFQ scheduler instead of deadline

Status in “linux” package in Ubuntu:
  In Progress

Bug description:
  Ubuntu server now uses the '-generic' kernel, as the '-server' kernel
  doesn't exist anymore. With this change the default server disk
  scheduler changed from deadline to CFQ. This is very bad for servers,
  deadline should absolutely be the default for servers.

  For example we moved some KVM images to an Ubuntu 12.04 server, but we
  had to revert as we got lots of disk errors and eventually frozen
  disks on these KVM's due to write timeouts. It took us a while before
  we found out that this 12.04 server used CFQ, which surprised us a
  lot.

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