System

top command on multi core processor

top command shows CPU usage as a percentage of a single CPU by default. That’s why you can have percentages that are >100. On a system with 4 physical or virtual cores, you can see up to 400% CPU usage. You can change this behavior by pressing I (that’s Shift + …

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Reasons to Stick with MySQL

mysql update

MySQL’s founder is encouraging people to steer away from his creation. Here’s why he’s wrong. Schism between the worlds of open source and proprietary software is never going to go away as long as open source remains viable and competitive. Eventually, you have a meeting of both worlds. In the …

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MySQL Update – MySQL Upgrade

mysql update

MySQL update process some times create issues like, MySQL server doesn’t start. when you perform MySQL update using yum update or yum update mysql or yum update mysql-server before restarting or stopping server  , you need to run command mysql_upgrade or mysql_upgrade -uroot -p MySQL Update Errors some time mysql …

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KVM Installation on CentOS 6

KVM and CentOS 6 CentOS 6 has native availability of KVM virtualization support and tools in the base distribution.  See the meta packages contained in: # yum grouplist | grep -i virt 1. Host Setup Install all the packages you might need. yum -y install @virt* dejavu-lgc-* xorg-x11-xauth tigervnc \ …

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NAS – Network Attached Storage

network-attached-storage-NAS

Network Attached Storage (NAS) Network Attached Storage (NAS) devices are storage arrays or gateways that support file-based storage protocols such as NFS and CiFS, and are typically connected via an IP network. These file-based protocols provide clients shared access to storage resources. This centralization of shared storage resources reduces management …

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SAN – Storage Area Networks

SAN - storage-area-network

Storage Area Networks Storage Area Networks (SAN) are a separate computer network typically based on a fabric of fiber channel switches and hubs, connecting storage subsystems to a heterogeneous set of servers on an any-server-to-any-server basis. A SAN enables direct storage-to-storage inter-connectivity and lends itself to taking advantage of new …

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SAN vs NAS – Storage Types Comparison

SAN vs NAS SAN vs NAS, The primary difference between SAN and NAS solutions is the type of access protocol. NAS protocols such as NFS and CiFS provide shared file level access to storage resources. The management of the file system resides with the NAS device. SAN protocols such as iSCSI and …

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