Recent Posts

Virtual Machine Live Migration – How it works ?

VM Live Migration timelines

Virtualization’s revolution has pushed many technical challenges from “impossible” category to the “possible” category. Live Guest OS Migration can be considered as one of the major benefits of the OS virtualization. Migrating the virtual machine from one host to another host without downtime facilitates fault management, load-balancing, and low-level system maintenance. It has eliminated all difficulties faced by process-level migration by just …

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Para virtualization vs Full virtualization vs Hardware assisted Virtualization

Types of virtualization

Virtualization is nothing but abstracting operating system, application, storage or network away from the true underlying hardware or software. It creates the illusion of physical hardware to achieve the goal of operating system isolation. In last decade, data centers were occupied by a large number of physical servers, network switches, storage devices. It consumed a lot of power and manpower to maintain …

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LINUX – SCSI Device Management – Identifying Devices

Linux SCSI Devices Management

This article is going to share very least used SCSI commands on Linux operating systems. These commands will be very useful to identifying SCSI devices and tuneable parameters. There are few utilities which can be used to get the detailed information about the scsi devices. lsscsi is most command tool which scans sysfs pseudo file system to provide the required …

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CLOUD WAR – Openstack vs VMware vSphere vs Amazon AWS

Cloud War or Data-center war ? There is a healthy competition out in the market to reduce the overall operating cost on IT.  Companies are benefited with the cloud revolution, Virtualization and automation. Most of the organisations are moving towards asset free to reduce their additional investments on IT equipment. But all the organizations can’t just follow the same strategy since …

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Oracle Solaris Cluster – Configure Standby Oracle Database – Dataguard – Part 2

Oracle Datagarud Standby- Sun Cluster Setup

Here is the step by step procedure to bring the oracle Dataguard standby instance under sun cluster control.Once you have completed the primary node setup , you are good to proceed with standby configuration. In this oracle Dataguard  configuration ,we will be using the standby nodes as DR servers and it must be configured as physical mode. Logical standby mode …

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Oracle Solaris Cluster – Configure Oracle Database with Dataguard- Part 1

Oracle Datagarud - Sun Cluster Setup

This article will provide step by step procedure to manage the oracle Database under Sun-cluster aka Solaris cluster on Oracle Dataguard environment. Oracle Dataguard is widely used product for the disaster recovery solutions.It provides great visibility to database administrator to manage their environment in better manner. Sun-cluster is used only on oracle Solaris operating system and use of this product …

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Amazon AWS – Change EBS volume type using Snapshot – Part 14

Snapshot AWS volume

This article will walk through that how to change the AWS EBS volume type using snapshot feature. There is a limitation with AWS that you can’t change the volume type on fly. You must need to halt the instance and change the volume type. But again  , you can’t switch to all the volume types available in AWS using that …

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Amazon AWS – Change volume type – SSD GP2 to SSD IOPS – Part 13

This article will walk through that how to change the AWS EBS volume type from  SSD GP2 to  SSD IOPS volume type. Changing the volume type  is not straight forward for all the volume types. Due to the instance limitation, you can’t change the volume type on the fly. You need to halt the instance in an order to change …

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Amazon AWS – Connect to AWS instance using Putty – Part 12

This article will walk through to connect to the AWS cloud instance using putty software from windows laptop. If you use MAC OS or Linux OS , you could easily connect to the AWS instance using the downloaded *.pem key file from AWS Portal. pem key file format is not supported in windows ssh client – Putty. You must need …

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Amazon AWS – Launching EC2 Cloud Instance – Part 11

Amazon EC2

This article will walk through to create the first AWS instance and launch it. We will also see that how to access the AWS instance from internet.  Configure the virtual firewall to protect the instance from different external attacks by restricting the number of allowed ports. You could also protect the instance against the accidental termination. By adding more tags …

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