----- Original Message ----- | I am setting up a file server with CentOS 7. I'm seeing | performance which is considerably slower than a similar | server running CentOS 6.6. A 3Gb directory can be copied | to/from the CentOS 6.6 server in about 50 seconds. The | same directory takes about 270 seconds to copy to/from | the CentOS 7 system. | | I see the same performance difference with NFS mounted | file systems or using scp, so it doesn't appear to be | an NFS issue. The MTU on the NICs on both systems is | 1500, and changing it to 6000 on the CentOS 7 system had | no effect. | | Anyone have any ideas what might cause this problem or | how to fix it? | | -- | Michael Eager eager at eagercon.com | 1960 Park Blvd., Palo Alto, CA 94306 650-325-8077 Do you have IPTables or FirewallD turned on? Are you using NFSv3 or NFSv4? Are these machines on the same switch? Any errors seen in `netstat -i` output? There could be lots of reasons for this problem from cabling to switch/host misconfiguration. -- James A. Peltier IT Services - Research Computing Group Simon Fraser University - Burnaby Campus Phone : 604-365-6432 Fax : 778-782-3045 E-Mail : jpeltier at sfu.ca Website : http://www.sfu.ca/itservices Twitter : @sfu_rcg Powering Engagement Through Technology