Linux Administration

There must be an entry in /sys/block/XXX # ls -lrt /sys/block/ /proc/partitions ==> cat /proc/partitions  major minor  #blocks  name    8        0   15728640 sda    8        1     512000 sda1    8        2   15215616 sda2    8       16    2097152 sdb  253        0   13148160 dm-0  253        1    2064384 dm-1 To list all the disk in the machine ==> fdisk -l # fdisk -l /dev/?d? To avoid all the dm devices. # fdisk -l 2>/dev/null | grep "Disk \/" Disk /dev/sda: 16.1 GB, 16106127360 bytes Disk /dev/sdb: 2147 MB, 2147483648 bytes Disk /dev/mapper/VolGroup-lv_root: 13.5 GB, 13463715840 bytes Disk /dev/mapper/VolGroup-lv_swap: 2113 MB, 2113929216 bytes # lsblk NAME                   ...

RHEL6 installation is very simple you just need to do some clicks and few selections and your operating system is ready. Assuming you have a RHEL6 disk and a system in which you can install RHEL6. Boot your machine and select the boot device a DVD. You will see a screen like the given below: Select the installation type as "Install system with basic video driver". If your disk is a new one then you can skip this check otherwise do check your disk for any errors. Here I did skip this step, as I was aware that this will not give any issues while installing the machine. After this you will see a screen somewhat like this, Just press Next. Choose a language as per your requirements. Choose the keyboard layout as per your requirements. Select the storage device in which you want to install your OS. Type the hostname of your machine(as per your requirements). Select the time-zone. Give root password for ...