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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal>My glusterfs-3.4.2-1.el6 is having a performance issue. It was working fine until the 100TB file system hit ~90% full. I was seeing around 90Mb/s for the last 10 months. This then dropped to 40Mb/s. Since nothing changed on the system, I focused on the transition to the 90% full file system. I also found that the 6 undelaying XFS files systems were pretty fragmented (~56%).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We are using gluster to achieve a large flat file system. This is a single server/node configuration, so no network issues are involved.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>As the problem is on a production system, I setup a smaller test system. I monitored performance and was able to duplicate the problem (90MB/s up to 90% full, then a drop off in performance thereafter). The closer to 100% full, the lower the throughput. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I then started deleting content from the test server. I was surprised to find that the performance did NOT increase – it stayed the same. I took the test system to file system 50% full but still saw 40Mb/s!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The test I set up was designed to fragment the XFS partitions (to mimic the production system state). I defragmented online successfully, however performance did not increase.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am currently trying a rebalance across the 6 XFS partitions to see if that helps.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I was wondering if anyone remembers a problem like this? Is there a chance that the rebalance will get me back to the normally seen performance? Would upgrading gluster fix this? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Bob<o:p></o:p></p></div></body></html>