Solaris Troubleshooting : System Hang – Sun Fire 280R
Step 1) What is exact cause of system hang (system, RSC, network)
Author: Ramdev
Solaris patching for new learners.
What is a patch? A patch fixes problems that prevent the proper execution of software. It is a collection of files and directories that replace or update existing files/binaries and directories. The entire OS is installed as a collection of Solaris packages. It is done during...
Solaris – Identify the product used for Storage Multipathing
For Solaris 8 hosts the common multipathing product is VxDMP or EMC PowerPath. And for Solaris 10 hosts it can be MPxIO (the majority), VxDMP or EMC PowerPath. It is important to note that both VxDMP and MPxIO can be active at the same time;...
VxVM Troubleshooting – Procedure to Replace Internal FibreChannel (FC) Disks controlled by VxVM
Hot swapping of a failed disk is fairly straight procedure if the disks are regular SCSI disks, but for the Fibre Channel (FC) disks we should follow different procedure for hot swaping. Below specific procedure should be used when replacing one of the internal disks in...
Using "asr-disable" to disable PCI slots from OK prompt – Servers V440 or V490
System Administrators encounter frequent issues with onboard PCI slots after the maintenance operations like the OS upgrades, patch installations and firmware upgrades. And often it will leave us in a situation that we couldn’t boot up the machine, because of the issues to recognize PCI slots after...
Redhat Enterprise Linux Networking Troubleshooting – Quick Reference
1. Network does not start due to “Device not managed by Network-Manager” error. Generally, this error occurs when the ethernet cable does not connect to the interface well and the interface is not configured properly. The solution for this issue is to ensure the link...
Solaris SVM – How to check on a running machine which disk was used to boot.
It is often possible that we boot from a Solaris machine from one of the root mirror disk, and after sometime we forget current active disk. And the information of active boot disk is important while we perform SVM maintenance disks. This post will help you...
Bash scripting – Nesting loops
A loop statement can use any other type of command within the loop, including other loop commands. This is called a nested loop. Care should be taken when using nested loops, because you’re performing an iteration within an iteration, which multiplies the number of times commands...
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...
DevOps Tool – What is Docker ?
Docker is the world’s leading software container platform. Developers use Docker to eliminate “works on my machine” problems when collaborating on code with co-workers. Operators use Docker to run and manage apps side-by-side in isolated containers to get better compute density. Enterprises use Docker to build...
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