[Bugs] [Bug 1200457] New: gluster performance issue as data is added to volume. tar extraction of files goes from 1-minute on empty volume to 20-minutes on volume with 40TB.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1200457

            Bug ID: 1200457
           Summary: gluster performance issue as data is added to volume.
                    tar extraction of files goes from 1-minute on empty
                    volume to 20-minutes on volume with 40TB.
           Product: GlusterFS
           Version: 3.6.2
         Component: unclassified
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: drobinson at corvidtec.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
The storage system slows down dramatically as data is added to the volume. 
This problem was discovered by downloading and trying to un-tar the boost
libraries source code.  On an empty volume the extraction takes 1-minute.  On a
volume with 40-TB, the extraction takes 20-minutes.

Version-Release number of selected component (if applicable):
gluster 3.6.2

How reproducible:
This problem is reproducible on my systems and it has been reproduced by Ben
Turner on the RedHat systems (email traffic from 2/17/15).  Ben was working
with Shaym to resolve this issue.  Debugging info was sent to Shaym on/around
2/10/2015 (strace, io-stats, etc).


Steps to Reproduce:
1.  Create a volume and add 20-TB of data.  
2.  time tar -xf boost.tar
3.  Create a new volume with no data
4.  time tar -xf boost.tar

Actual results:
volume with 20-TB: 20 minutes
empty volume: 1 minute

Expected results:


Additional info:

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