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[berend <berend@xxxxxxxxx>]

Wrong again, got exactly the bad behaviour on Ubuntu 13.10. It's perhaps
not related to the issue that started this thread, but since I posted
here I thought I might as well inform anyone visiting this that my
solution didn't work.

My current thinking is that if you have an NFS4 server with clients
attached, and you reboot the server without detaching the clients, you
get the bad behaviour. If you umount the clients first, then reboot the
server, then mount the clients, the problem doesn't occur.

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https://bugs.launchpad.net/bugs/607560

Title:
  jbd2 writing block every 5 - 10 seconds, preventing disk spin-down and
  making noise

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  jbd2 writes blocks to the hard disk every 5 seconds.  This makes an
  annoying click/tick noise and prevents the disk from spinning down to
  conserve power.  jbd2 appears in logs as several entries like...

   Jul 19 21:35:45 edge kernel: [ 3312.913759] jbd2/sda5-8(350): WRITE
  block 42280704 on sda5

  ... and can be observed using iotop. Since the noise only occurs in
  Ubuntu and not in Windows 7 it is probably a software problem.  The
  excessive writes may reduce the disk's lifespan.

  WORKAROUND: Adding commit=60 to the partition's entry in fstab
  increases the interval to 30-45 seconds.

  Threads covering this problem
  * http://ubuntuforums.org/showthread.php?t=1489637
  * https://bbs.archlinux.org/viewtopic.php?pid=692073

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-23-generic-pae 2.6.32-23.37
  Regression: No
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.32-23.37-generic-pae 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-23-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  rcx      2456 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf0800000 irq 22'
     Mixer name	: 'Intel G45 DEVIBX'
     Components	: 'HDA:10ec0269,17aa21bc,00100004 HDA:80862804,80860101,00100000'
     Controls      : 16
     Simple ctrls  : 8
  Date: Mon Jul 19 23:24:03 2010
  Frequency: Every 5-10 seconds.
  HibernationDevice: RESUME=UUID=ae276af8-b805-466a-a688-8d175cd3f2d7
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: LENOVO 05782AU
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-23-generic-pae root=UUID=01d19f79-8c81-4da6-949d-db8f4d85b84a ro quiet splash
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.utf8
  RelatedPackageVersions: linux-firmware 1.34.1
  SourcePackage: linux
  dmi.bios.date: 06/11/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 80ET37WW (1.14 )
  dmi.board.name: 05782AU
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr80ET37WW(1.14):bd06/11/2010:svnLENOVO:pn05782AU:pvrThinkPadEdge:rvnLENOVO:rn05782AU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 05782AU
  dmi.product.version: ThinkPad Edge
  dmi.sys.vendor: LENOVO

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