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centos linux

hdparm: HDIO_DRIVE_CMD(identify) Failed: Inappropriate Ioctl For Device

When I run hdparm -tT /dev/sda command under CentOS / RHEL I get the following error on screen:

Timing buffered disk reads: 908 MB in 3.00 seconds = 302.39 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device

How do I fix this problem?
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Samba: Allow Domain Controllers Create Machine Trust Accounts On-the-Fly

How do I allow domain controllers to create machine trust accounts on-the-fly under RHEL CentOS Linux version 5.x?
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CentOS / RHEL Configure Yum Automatic Update Retrieval and Installation

The yum command line tool is used to install and update software packages under RHEL / CentOS Linux server. I know how to apply updates using yum update command line, but I'd like to use cron to manually update packages where appropriate. How do I configure yum to install software patches / updates automatically with cron?
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CentOS Add Route Command

How do I add route (router IP to my Centos Linux systems from the command line?
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CentOS or Redhat Enterprise Linux

Can you explains the basic difference between CentOS and RHEL?
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While updating my CentOS / RHEL HP Linux server via yum command it givens an error which read as follows:

There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them

How do I fix this problem under RHEL / CentOS Linux 5.x server operating systems?
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Red Hat / CentOS: Check / List Running Services

Q. How do I list all currently running services in Fedora / RHEL / CentOS Linux server?
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Update Centos Linux

How do I update Centos Linux 5 software and apply security patches?
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How do I install all developer tools such as GNU GCC C/C++ compilers, make and others, after installing CentOS or RHEL or Fedora Linux from a shell prompt?
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Find Out Vmware Server Version Under Linux Server

Q. Under Windows it is pretty easy to find out VMware server version. How do I find out remote vmware server version using ssh client running under RHEL / CentOS Linux 5.x?
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