I tested s3ql filesystem.
Test script is below.

 1. cp 100MB * 10 files to NFS mounted directory. 
 2. ls that dir. 
 3. rm all files(written in step 1.) 
 4. return to step 1.

After 1 day and half later, s3ql changed its state to "failsafe mode" with 
this log. 
---------
  2016-04-14 08:50:29.585 4026:Metadata-Upload-Thread s3ql.mount.run: 
Remote metadata is newer than local (22 vs 21), refusing to overwrite and 
switching to failsafe mode!
---------

To prevent loosing data, I specified 10 seconds for 
"metadata-upload-interval" mount option.
Is this interval too short?
What is the suitable value for "metadata-upload-interval" mount option?

If the interval is changed longer value, occurrence frequency of this state 
changing will probably be declining. 
But this error will occur. It depends on timing. I think there is some 
problem.

Thanks.

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