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Forum Discussion

joki's avatar
joki
Tutor
Oct 08, 2015
Solved

btrfs-cleaner frequently stuck at 100% CPU after 6.4.0 upgrade

Since I upgraded my RN102 to 6.4.0 last night I frequently have trouble reaching the admin interface, and my laptop has reported not being able to reach Time Machine.   When I login by ssh and use ...
Installation & Upgrade
Performance
  • HansWeihnacht's avatar
    HansWeihnacht
    Oct 21, 2015

    It seems like I found a way to get rid of the hanging btrfs-cleaner: After switching off quota

    btrfs quota disable /data

    btrfs-cleaner did never show up again (in top).

    (After booting I usualy had about a minute to issue the command before btrfs-cleaner did spawn and prevented the command to respond.)

     

    I did not intentionally enable quota - i guess it was enabled by default.

     

    Good luck,

       HansW

     

    PS: Maybe the problem is known by Netgear - in their "FAQs on recently released firmware 6.4.0" (see link on top of page) they talk about "... this is likely due to the ReadyNAS performing a quota check".

    Some websites also describe problems with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).

    I did not extensive testing after diabling quota that way - I'm happy that I can acces my files again ...

AlexPe's avatar
AlexPe
NETGEAR Expert
Oct 08, 2015

Hi Joachim,

 

Did you recently delete a very large file or a lot of files? Has there been any delete request like this or similar sent to the volume? 

 

btrfs-cleaner is used when there is a large file(s) deletion.

 

Alex

 

 

joki's avatar
joki
Tutor
Oct 13, 2015

Hi Alex,

 

most of the data traffic on my RN102 is from TimeMachine on a couple of macs, but the load hasn't changed since before the update.

 

I'm still getting very high load from btrfs-cleaner several times a day, so much so that TimeMachine gives an error message saying the backup disk isn't available. The CPU time after 6 days is now up to a record 1270 minutes for btrfs-cleaner with readynasd at a mere 36 minutes, according to "top".

 

Joachim

 

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