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slow performing system

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http://www.unix.com – Friends Greetings. I have a RedHat 5.7 64bit virtual server on VMware ESXi 4.1. This server and other Redhat Servers are running very slow. I did some stats collection on ESXi and looks like Linux is holding the disk IO. I am not sure what is causing this behavior. On Linux I checked the CPU and Mem utilisation which is very low, however I see high disk utilisation which is because of the activity. To copy 30 GB data it takes 7 hours. We are using NOOP disk schedular. This has been recommended by both vmware and redhat. Its not the network because the copy source is on the same virtual infr (HowTos)