varsha 
vinay Xen : Administration commands
cloudibee Xen Daemons For the Xen server to function properly, the below daemons must be running on the VM server. xend : This is the Xen server control daemon. This daemon…
Managing Xen
Here are some xm and virsh commands for creating, managing, and troubleshooting xen virtual machines. Staring and Stopping VMs xm create – Create a domain based on config file xm…
Dont pipe cat
A basic-but-common grep usage error involves pipe’ing the output of cat to grep to search the contents of a single file. This is absolutely unnecessary and a waste of time,…
Disk information using smartctl
/usr/sbin/smartctl – controls the Self-Monitoring, Analysis and Reporting Technology (SMART) system built into many ATA-3 and later ATA, IDE and SCSI-3 hard drives. The purpose of SMART is to monitor…
How to identify whether the machine supports full-virtual guests?
To run fully virtualized guests, host CPU support is needed. This is typically referred to as Intel VT, or AMD-V. To check for Intel VT support look for the ‘vmx’…
How to identify whether the machine supports para virtual guests?
If the machine supports para virtual guests, then you should see a “pae” flag in /proc/info. This means – the machine has PAE support and can run para virtual guests.…
Netapp – how to identify disk speed
Command: storage show disk –a (or) vol status –r Filer> storage show disk –a Disk: 2b.18Shelf: 1Bay: 2Serial: XYZASDFVendor: NETAPPModel: X266_MTOMC320PADRev: R5VVRPM: 5400WWN: x:200:xxxx:1817d2 Filer> vol status -r RAID Disk…
Netapp performance troubleshooting – nfs_hist
This command displays the latency details of each NFS call and its histogram. Zero the counter with –z option before you start debugging. You should be in advanced privilege to…
Load Average
A very good article on Unix Load averages and how it is calculated . Worth reading for every sysadmin and performance engineers.
OpenProj – Project tool
In project management tools, now there is an alternative to MS Project. OpenProj is a new open source solution for project management. It’s simple user interface is very similar to…
Simple x86 Hypervisor – Lguest
lguest – A simple and tiny virtualization solution for x86. URL : http://lguest.ozlabs.org/
Ganeti – Virtual Server Management in Google Code
http://code.google.com/p/ganeti/ – Ganeti is a virtual server management software tool built on top of Xen virtual machine monitor – found this in Google code. Ganeti features: support for Xen virtualization.…
Difference between kvm and Xen
Xen is an external hypervisor; it assumes control of the machine and divides resources among guests. On the other hand, kvm is part of Linux and uses the regular Linux…
dmidecode
Dmidecode reports information about your system’s hardware as described in your system BIOS. This command gives you vendor name, model name, serial number, BIOS version, asset tag as well as…
clockdiff
Find clock different between two hosts in linux – using clockdiff # clockdiff -o unixfoo2 ………………………………………….. host=unixfoo2 rtt=60(3)ms/54ms delta=22153ms/22153ms Mon Oct 29 01:42:13 2007 # clockdiff -o unixfoo3 ………………………………………….. host=unixfoo3…