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This is post #6 in my December 2013 series about Linux Virtual Machine Performance Tuning. For more, please see the tag “Linux VM Performance Tuning.” Modern operating systems are fairly modular, and often have different modules to deal with memory, network I/O, and CPU scheduling. Disk I/O is no exception under Linux, as there are usually four different schedulers a sysadmin can choose from. Red
This is post #4 in my December-long series on Linux VM performance tuning, Tuningmas. One of those timeless questions in system administration has always been “how much swap space do I configure on my server?” The old rule used to be twice the amount of memory, but does a server with 256 GB of RAM really need a half terabyte of swap? And what about VMs? Swapping on VMs is a serious performance dra
Did you know that when you’re using OpenSSH from the command line you have a variety of escape sequences available to you? SSH somewhere, then type “~” and “?” (tilde, then question mark) to see all the options. You should get something like: Supported escape sequences: ~. - terminate connection (and any multiplexed sessions) ~B - send a BREAK to the remote system ~C - open a command line ~R -
How to Configure IPMI on a Dell PowerEdge running Red Hat Enterprise Linux This is intended to help fairly knowledgeable people get IPMI working on their hosts so they can issue remote commands to their hardware. I focus on Red Hat Enterprise Linux on a Dell, but it is likely to work on other hosts, distributions, and OSes, too. This works for me on Dell PowerEdge 1850, PowerEdge 2850, Dell PowerE
Configuring and Securing IPMI on Dell PowerEdge x8xx Hardware Update: I have posted a newer version of this article. So I just spent about 10 hours of my life getting IPMI working on some Dell PowerEdge 1850s and 2800s so I can cycle their power over the network, and turn them on if the power goes out. That was a lot more challenging than I thought it’d be, mostly because there are about zero good
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