https://community.cloudera.com/t5/Support-Questions/Copying-Data-to-HDFS-takes-too-much-time/m-p/164634#M127001 <P><A rel="user" href="https://community.cloudera.com/users/504/kkulkarni.html" nodeid="504">@Kuldeep Kulkarni</A> </P><P>Kuldeep i am using physical servers.</P><P>I have disabled thp on all the machines.</P><P>MTU is set to 1500 on all nodes.</P><P>1 disk for hdfs is configured on each node.</P><P>I have mounted my disk to a directory /hadoop on the same place where /home is mounted.</P><P>The output of iostat in all the nodes is as follows.</P><P> Linux 2.6.32-573.26.1.el6.x86_64 (HadoopMaster) 06/01/2016 _x86_64_(8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 1.94 0.00 0.35 0.00 0.00 97.72 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 3.14 14.90 84.24 34145512 193106040 iostat Linux 2.6.32-573.26.1.el6.x86_64 (HadoopSlave1) 06/01/2016 _x86_64_(8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.88 0.00 0.25 0.00 0.00 98.87 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 3.04 4.15 61.54 9603544 142454696 Linux 2.6.32-573.26.1.el6.x86_64 (HadoopSlave2) 06/01/2016 _x86_64_(24 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 1.14 0.00 0.19 0.00 0.00 98.67 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 5.07 0.54 361.55 1252416 836898568 sdb 0.00 0.00 0.00 3349 0 Linux 2.6.32-573.26.1.el6.x86_64 (HadoopSlave3) 06/01/2016 _x86_64_(8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.91 0.00 0.19 0.06 0.00 98.83 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 1.82 0.57 53.04 1319364 122732448 Linux 2.6.32-573.26.1.el6.x86_64 (HadoopSlave4) 06/01/2016 _x86_64_(2 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 3.31 0.00 0.84 0.00 0.00 95.85 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 1.43 0.57 39.10 1308076 89922904</P> Wed, 01 Jun 2016 02:08:46 GMT hari1 2016-06-01T02:08:46Z