Additional information on AIX System Administration – II

This is a continuation to the Post “Additional Information on AIX System Administration – I”

• Fuser or lsof command is basically used to check why a file system is not getting unmounted.

             # fuser –u <file system>

Eg:

            # fuser –u /data

This command will list the process numbers and user login names of processes using the /data file system.

• /etc/resolv.conf is used to provide a list of nameservers and domains to search for hosts. This file is used to configure DNS client.
• /etc/netsvc.conf file is used to modify name resolution lookup order. It specify name resolution and host settings.
• Vmstat command gives system’s average CPU usage. Vmstat also gives information about number of system calls per second. It also provides information on performance bottlenecks.
• SAR also shows cpu usage for a particular processor. Command used is:

             # sar –u

• If a new fileset is installed to check what all files are installed, command used is:

             # lslpp –f <filename>

• ML (Management Level) is a collection of APARs.
• Kernel is always represented with logical device called Sys0.
• Perfagent tool is the package used for running performance tuning commands like svmon, filemon, tprof etc.
• Iptrace and tcpdump is used to identify packet sequence problems.
• Raid0 is used for hardware stripping and Raid1 is for Mirroring. (we will discuss more about Raid concept in later posts)

Till then,

Happy learning!