How to Fix 100% CPU Usage on Synology Diskstation NAS

poster

Implementing the Fix

After more investigation, it appears that this is a known issue with DSM 3.0 (as of 3.0-1337).   Any files in the default “photo” share will cause the NAS to automatically process them, resulting in the “convert” gobbling up all of the CPU.  I created a “photo” directory in the “public” share and moved the files (using the Linux “mv” command moved all of my photo files instantly, other than the hours it would have taken to move them via the network). I used PuTTY to login as root and move the files via the command line.


Make sure to enable SSH access before trying to use a terminal emulator like PuTTY

In order to prevent any accidental photo deposits in this “photo” share (thus starting this problem all over again), I hid the “photo” share from “My Network Places”. This is easy to do: just click on Control Panel, then Shared Folder.  Select the Photo share and click the Edit button.  You can then choose to hide this share from any Windows computer that browses the available shares on your NAS.



Hide the system-created “photo” share from the Control Panel

After implementing this fix, CPU usage went down dramatically and hovered around 5 to 10 percent.  I didn’t notice any substantial network throughput improvements, but Hard Drive Hibernation mode now works, and the NAS uses less electricity, which also translates into less heat.

It’s a shame that this bug exists, because it forces users to choose between a compromised NAS or a nifty media application.  Hopefully Synology will fix this in future updates, but as it stands I no longer use the default photo share.

Alan is a web architect, stand-up comedian, and your friendly neighborhood Grammar Nazi. You can stalk him on the Interwebs via Google+, Facebook and follow his ass on Twitter @ocmodshop.

24 Comments

  1. Cloutian21

    April 17, 2015 at 4:22 pm

    FYI, this only needs to be done with the “photo” folder. The others don’t seem to be affected.

    Should also be noted that this is still happening even with the lasted DSM 5.0+ version.

  2. Brian Barnard

    March 4, 2014 at 6:40 am

    Thanks a lot. It worked on my DS112!

  3. David Pasek

    December 8, 2013 at 2:57 am

    Great post. It helped me. Thanks for write-up!!!

  4. Rob

    July 31, 2013 at 12:06 pm

    I just got a Synology NAS a few months ago and it's going to be my last from them not because I don't generally like my unit, but because the company continually ignores their customers. We don't need this 'feature', but are happy to have it in there as an 'OPTION'. I've struggled with this idiotic problem since day 1, as have thousands of others.

    Great selling feature for QNAP, though.

  5. sl_blackcat

    February 14, 2013 at 8:39 am

    I have the same problem with may DS212J but solve it in a different way : I fallow this post http://www.markinthedark.nl/news/ubuntu-linux-uni

  6. Use4Video

    January 4, 2013 at 4:12 am

    Thanks for this article! I just got a DS410 and ran in to this issue with DSM 3.1

  7. hansen

    December 20, 2012 at 1:16 am

    THANKS the great advise. It works!

    After 2 years of frustration, you are the one who solved it.
    I never got any direct / useful reply from Synology support, that's really bad.

    (DS210j on DSM 3.0)

  8. Andreshs1

    November 16, 2012 at 9:39 pm

    Thanks mate!!!

    Great fix!!!

  9. Sebastian

    October 7, 2012 at 12:50 pm

    Wow, this is crazy. I recently bought the DS411, latest drivers, and there is this really annoying bug. Kinna disappointed at Synology. As described, moving your photos from the Media Server share (photo) solves the problem. But big thanks to Alan!

  10. Marcelo

    September 15, 2012 at 7:50 pm

    I have the same issue on a DS211+. I have combined the suggestion from Joost with the procedure from Alan (btw THANKS A LOT!). Now I see the CPU under 10% most of the time. Too bad how Synology keeps struggling with this release after release.

    (Synology DS211+, DSM 4.1 – 2636)

  11. Joost

    June 14, 2012 at 1:48 am

    I discoverd the same problem. After disabeling Photo Station and Mediaserver, the problem was over.

    Yes indeed: a strang bug.

    (Synology DS212+, DSM 4.0 – 2228)

  12. Paul

    June 2, 2012 at 12:17 pm

    dammit, I also have this blasted photo conversion process hogging 100% of my CPU …I dont need this sucker to convert my damn photos (who in their sane mind would want this) !?!?!? – have a new DS212 with latest software…first time user of Synology

    Come on Synology, sort it out as this has been going on for a long time dragging myself through Forum after Forum

  13. AndersH

    September 7, 2011 at 1:20 am

    Has any of you reported this to Synology? Just to make sure that we are not just sitting here complaining about the problem without actually raising a support case with Synology so they can do something about it… :-)

  14. dex

    August 27, 2011 at 1:02 pm

    Hi. This "bug" (more a Synology's typo) is still underway… A shame =[

  15. Bard

    August 7, 2011 at 12:21 pm

    Very good post.
    Same problem for me with my DS209. DSM 3.1 – 1748

    Removed all of the files from "phone" share and CPU went down from 100% to 25 %

    Thx.

  16. Roy

    June 20, 2011 at 1:17 am

    I had the same problem, and your fix worked for me on my DS211.
    the reason to use the linux mv command compared to the file browser is that the linux command is instant. So all your files are instantly in your new folder

  17. melsius

    June 20, 2011 at 1:17 am

    had the same here on my Syno 207+ after upgrading to DSM 3.1
    moved all pictures: CPU is down form 100 to 15 to 20 average
    noticed while moving dirs that convert remains high cpu user until the last file is deleted from photos even if the last files where no picture files
    anyway, everything back to normal now
    thanks for the advise

  18. eilsoe

    June 20, 2011 at 1:16 am

    I had the same problem on CS407e
    I moved all my photo files into another share and convert went away.

    Thanks for sharing this information.

  19. podosta

    June 20, 2011 at 1:16 am

    Thanks a lot !
    Had this problem on DS411j DSM 3.0-1354

  20. Dave

    June 20, 2011 at 1:16 am

    Thanks for this article! I just got a DS410 and ran in to this issue with DSM 3.1. I simply renamed my 'photo' share to 'pictures'. Hopefully this can be fixed without the need for this workaround.

  21. Jonas

    June 20, 2011 at 1:16 am

    I had this problem to with DSM 3.1. convert was running for over a week until I moved my photos to another map "Photo".

  22. Alan

    June 20, 2011 at 1:15 am

    @totoro: Hmmm… I guess I could have done that and saved myself some trouble. I didn't think of that, but it was so obvious!

  23. totoro

    June 20, 2011 at 1:15 am

    Why did you have to use putty to move the directory? Too much of a linux fan to use the DSM file browser? :)

  24. melsius

    June 10, 2011 at 7:37 pm

    had the same here on my Syno 207+ after upgrading to DSM 3.1

    moved all pictures: CPU is down form 100 to 15 to 20 average

    noticed while moving dirs that convert remains high cpu user until the last file is deleted from photos even if the last files where no picture files.

    anyway, everything back to normal now

    thanks for the advise

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