[Moosefs-users] Slow operation during chunk testing

[Fredrik R. <fr...@se...>]

Hi,

 I'm quite new to moose and decided to test it with a media archive. 

My configuration is 

1 x master server running intel Atom D525 with 4 GB of memory.
2 x chunk servers also running Atom D525 with 4 GB of memory.
      Each chunk server has a 6 x 2 TB drives mounted as /moose-$serialnumberofdrive

What I've found after some testing is that for the most part performance is acceptable however I find that there are periods where its very very slow.
When this happens I also see reads of 2 - 300 megabytes/second for each drive.

Looking at when its slow it seems that this happens when it does testing of chunks.

After checking the configuration I see the following parameter:

HDD_TEST_FREQ = 10

What would be the recommended value of this parameter? I've been trying to search for documentation or an explanation of pro/con's of lowering or increasing this value.
I would like to see that the checks are much more rare and that when they do happen they are very very low priority.

Thank you for any feedback on this.

Regards,
Fredrik Rovik