Linux Fibre Channel over Ethernet implementation code released

Posted on in Categories Linux, Linux Scalability, Linux Virtualization, Networking, Open source coding, Storage last updated December 18, 2007

Intel has just released source code for Fibre Channel over Ethernet (FCoE). It provides some Fibre Channel protocol processing as well as the encapsulation of FC frames within Ethernet packets. FCoE will allow systems with an Ethernet adapter and a Fibre Channel Forwarder to login to a Fibre Channel fabric (the FCF is a “gateway” that bridges the LAN and the SAN). That fabric login was previously reserved exclusively for Fibre Channel HBAs. This technology reduces complexity in the data center by aiding network convergence. It is targeted for 10Gps Ethernet NICs but will work on any Ethernet NIC supporting pause frames. Intel will provide a Fibre Channel protocol processing module as well as an Ethernet based transport module. The Open-FC module acts as a LLD for SCSI and the Open-FCoE transport uses net_device to send and receive packets.

This is good news. I think one can compare bandwidth and throughput for copper and fiber Ethernet. If you are going to use copper you need to stay within 15m of the switch. This solution will try to bring down cost. One can connect to 8-10 server to central database server with 10G and there could be few more applications.

=> Open FCoE project home page

Download of the day: Oracle VM

Posted on in Categories Download of the day, High performance computing, Linux, Linux distribution, Linux Virtualization, Networking, xen last updated December 12, 2007

Virtualization is the process of abstracting computing resources such that multiple operating system and application images can share a single physical server, bringing significant cost-of-ownership and manageability benefits. Through its Oracle VM product, Oracle offers scalable, low-cost server virtualization for heterogeneous applications.

Oracle VM is free server virtualization software that fully supports both Oracle and non-Oracle applications, and is three times more efficient than other server virtualization products.
Continue reading “Download of the day: Oracle VM”

Quick Tip: Send Ctr + Alt + Del to XEN Vps / Guest os

Posted on in Categories CentOS, Howto, Linux, Linux Virtualization, RedHat/Fedora Linux last updated December 6, 2007

If you hit CTRL+ALT+Delete your host will go down under CentOS Linux 5.x. The solution is hit CTRL key thrice. Now it will disable CTRL+ALT+Del for host. Next just hit alt+del to complete guest CTRL+ALT+Del cycle.

Alternatively, you can type the following on host to shutdown vps:
xm shutdown myGuestVpsOsName

XEN Server Status Monitoring Command Cheat Sheet

Posted on in Categories CentOS, Debian Linux, Howto, Linux, Linux Virtualization, Monitoring, RedHat/Fedora Linux, xen last updated November 15, 2007

The xm command is the main command line interface for managing Xen guest domains. The program can be used to create, pause, and shutdown domains. It can also be used to list current domains, enable or pin VCPUs, and attach or detach virtual block devices.

Please note that before running any one of the following command you must run xend ( Xen control daemon aka service) and must be run as privileged user. Running xm command as non root will return an error.

I hope following XEN status monitoring cheat sheet will save your time.
Continue reading “XEN Server Status Monitoring Command Cheat Sheet”

How to: Upgrade Red Hat Enterprise Linux (RHEL) to latest Releases 5.1

Posted on in Categories CentOS, Howto, Linux distribution, Linux Virtualization, RedHat/Fedora Linux, Sys admin, Tips last updated November 8, 2007

RHEL 5.1 has been released. Redhat announced the availability of Red Hat Enterprise Linux 5.1, with integrated virtualization. This release provides the most compelling platform for customers and software developers ever, with its industry-leading virtualization capabilities complementing Red Hat’s newly announced Linux Automation strategy. It offers the industry’s broadest deployment ecosystem, covering standalone systems, virtualized systems, appliances and web-scale “cloud” computing environments.

Besides supporting Linux virtual machines, RHEL 5.1 will also support Windows XP, Windows 2000, Windows Server 2003 and the forthcoming Windows 2008, Crenshaw said. RHEL 5.1 uses Xen for its virtualization.

How do I upgrade to RHEL 5.1?

Login as the root user and simply type the command to fetch all updates via RHN:
# yum update
Depend upon your network condition and software configuration it may take anywhere between 5-20 minutes. Once completed, just reboot the server:
# reboot
Verify that everything is working fine:
# netstat -tulpn
# netstat -nat
# tail -f /var/log/messages
# egrep -i 'error|warn' /var/log/messages
# egrep -i 'error|warn' /path/to/apps/log

Community driven enterprise CentOS Linux users should expect update soon too. You can apply above commends to upgrade your CentOS box.

How to: Install and Setup XEN Virtualization Software on CentOS Linux 5

Posted on in Categories CentOS, High performance computing, Howto, Linux, Linux Virtualization, RedHat/Fedora Linux, xen last updated May 25, 2010

Xen is a free open source software virtual machine monitor for Intel / PowerPC architectures. It is software that runs on a host operating system and allows several guest operating systems to be run on top of the host on the same computer hardware at the same time (just like VMWare software). Luckily Installing and managing XEN is quite easy under CentOS 5 Linux.