Its now possible to extend LVM disk/partition to more than 2TB that too without using Parted, GPT or Kernel editing.After doing lots of Googling and not a single article explaining about extending LVM volume without GPT, I came up with this article which has been fully tested and working. It was tested on a 4TB disk with a single partition of 3.5TB. The LVM extension can be done without loosing any data although I would still recommend backing up the data as a precautionary measure.

NOTE: This has been tested in a DEV environment and assume no responsibility with regards to performance effect on the disk/volume in Production although the disk tested has been in a perfect condition and working for more than 2 years now.

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Its possible to change the interface name in Linux and reload without a reboot. It usually happens in Virtual environment where you add / remove interfaces frequently. You need to take note of the interfaces before you do any changes. Make sure that there are no active connections going to the NIC as you are going to restart the network service for the chagesz to take effect. Again you would not need a reboot.

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Scripting Nagios Custom checks is not that hard. Its a case of getting hold of group of commands, piping them and extracting the Status of a Service and then passing them as Variables with If THEN ELSE STATEMENTS, that in-turn informs Nagios the status of the Service being monitored.

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