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varsha 
samanvya Linux tips : tftpd
cloudibee When you are trying to analyze/debug tftpd service on your linux boot server , you expect tftpd to return more debug information on the logs. To setup tftp in debug…
Netapp : Pocket Survival Guide
The url http://www.cs.fiu.edu/~tho01/psg/netapp.html has good information on netapp command set and its usage. A quick reference guide for a netapp admin. The site also has tips for Solaris, Veritas, EMC,…
Netapp Tips : Changing exports
/etc/exports file controls the nfs exports on a netapp filer. An easy way to edit this file is described below. From your unix box : rsh netapp rdfile /etc/exports >…
Perl : Xen API
Xen host can be monitored and controlled via Xen API ( it uses XML-RPC communications). Here is a sample how to program using XenAPI. For XenAPI to work, you should…
Filesystem : noatime
Most file systems store and maintain three separate time stamps per file. They are create time last modified time last accessed time The last accessed time stamp may have to…
Netapp : disk zero spares
To clean up the spare disks and zero them, use the below command. Having a zero’d spare disks can reduce time when on volume creation or on volume reconstruction. filer1>…
Linux VLAN configuration
1. Connect the eth0 interface of your linux machine to the switch. 2. Remove the IP Address information on the eth0 interface # ifconfig eth0 0.0.0.0 # ifconfig eth0 up…
Netapp tips : Disk firmware upgrade
After a Netapp failed disk swap, if an autosupport message is sent saying that the disk firmware is downrev, please run the following command. filer1> disk_fw_update Make sure that the…
Xen Wireless
Details on howto setup Xen on WiFi network : http://wiki.xensource.com/xenwiki/XenWifi . Good one.
Xen tutorial
Xen lets you create guest operating systems (*nix operating systems like Linux and FreeBSD), so called “virtual machines” or domUs, under a host operating system (dom0). Using Xen you can…
Files used by process
To check what files are being used by a process, you can use lsof with option -p. Example: # lsof -p 2791COMMAND PID USER FD TYPE DEVICE SIZE NODE NAMEsyslogd…
Xen : Administration commands
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…