Category: Linux Admin

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Linux Admin Reference – Device Mapper Multipath ( DM-Multipath) Configuration – Red Hat Enterprise Linux 6

In Enterprise Linux Environment, External storage often permits devices to be accessed by multiple physical paths. This improves redundancy and availability. SAN environment Red Hat Enterprise Linux provides the device-mapper-multipath component to manage multipath capable storage and to present multipath devices to applications running on the...

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Linux Admin Reference – 32bit mode vs 64bit mode – Redhat Enterprise Linux

There are two primary modes of operation of the microprocessor architecture: Long mode (lm) and Legacy mode. Long mode is used by 64-bit operating systems. It combines the processor’s native 64-bit mode and a 32-bit/16-bit compatibility mode. Under this mode, 64-bit, 32-bit and 16-bit applications may...

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Red Hat Enterprise Linux on HP Servers – Unexpected Server Reboots

The Server Environment which has Linux Servers installed on HP, occasionally encounter the issue of unexpected server reboot without any related log in system logs. And There are no kernel panics and no perfornamce issues ( SAR reports the usage utilization is normal) except the below...

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Linux Admin Reference – Network Bonding – Redhat Enterprise Linux ( RHEL5 / RHEL6)

  Bonding is a feature that can be enabled bu the Linux kernel, to allow system administrators to combine two or more network interface to form a single, logical “bonded” interface, for redundancy or increased throughput purpose. We can configure Linux bonding in 7 different modes. The behavior of the...

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RHEL 6 – Controlling Cache Memory / Page Cache Size

What is Page cache ?  When a user process reads or writes a file, it is actually modifying a copy of that file in main memory. The kernel creates that copy from the disk and writes back changes to it when necessary. The memory taken up...

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