Performance and Monitoring Tool
 Uptime,w,who,whoami,free,top,iostat,vmstat,tcpdump,netstat,traceroute,

/etc/fstab
ILO
Kernel Tuning
NIC Bonding

Patch Management
Steps
1.Need to take backup of config files before start patching or reboot or any changes in configuration
such as
df -hP
fdisk -l
grub.conf
/etc/fstab
ifconfig
pvs,
vgs
cat /proc/net/bonding/bond0

2.Need to check ILO console whether working properly
3. Should check dmesg file
4. Request to Backup team (TSM, Netbackup) to take full system backup.
5.Download the required patches
6.Using yum and update the patches
7. In case server is not coming up after done the patch
      Need to roll back(revert)
      Restore

Scan and Configure new LUNs on RHEL

free=total-used
total=total memory in the system
Used=The memory currently in use/reserved by running process

shared=Memory being shared by multiple process

How much memory really being used
used- (buffer+cached)

How much memory is really free
free+(buffer+cached)

How to find processor
uname -r
grep flages /proc/cpuinfo
  flag lm-long mode CPU 64-bit
  Real mode -16 bit
  Protected mode -32-bit

32 Bit- i386,i586,i686
64 Bit - x86_64

Symbolic link
Hard Link
Inode

Special Permissions
Sticky bit
SUID,SGID

Cron jobs

Repairing File System

File Prevention

File System Creation and Extend

How to see File system status?

Manage Linux group using gpasswd command

Kickstart installation and Configuration

Basic config, Installation Method, Boot loader option, Partition infm, N/w config, Authentication,Firewall config,Display config

Remove GRUB Password