Archive for the ‘Uncategorized’ Category

Integrating Cell based system in to ROCKS

Thursday, December 11th, 2008

After successfully installing Fedora 9 on Cell based system (Mercury 1U dual cell blade based system), now we had to integrate it in to a ROCKS cluster.

ROCKS sends the appropriate kernel image by looking at the vendor-class-identifier information. Current DHCP configuration file supports only IA64 (EFI), x86_64, x86 and of course, network switches. Although, ROCKS no longer supports IA64 (Itanium), the code is still there.

The first task is to add the Cell system in to the ROCKS database. We decided to add the node as a “Remote Management” appliance than as a compute node. Adding as compute node would modify the configuration files for SGE or PBS and will always show up as “down” status. To do this, execute the following command:

insert-ethers --mac <give your mac id here>

When the insert-ethers UI shows up, select “Remote Management” and hit ok. You may also choose to provide your own hostname using the option “–hostname”

The next task to identify the vendor class identification for the Cell system. After a quick test, it was determined that the system had no vendor class identifier. Since we were dealing with only one system, the best option was to match the MAC ID of the sytem with the following elsif block:

        } elsif ((binary-to-ascii(16,8,":",substring(hardware,1,6))="0:1a:64:e:2a:94")) {
                # Cell blade System
                filename "cellbe.img";
                next-server 10.1.1.1;
        }

“cellbe.img” is the kernel image for the Cell system. This has to be copied to “/tftpboot/pxelinux/”.

These changes will be lost if dhcpd.conf is overwritten, which happens every time you execute insert-ethers or use

dbreport dhcpd

to overwrite the file.

You could generate a patch file and patch the dhcpd.conf every as needed or you could edit

//opt/rocks/lib/python2.4/site-packages/rocks/reports/dhcpd.py

to include the new elsif block everytime the file is generated.

If you see your cell system is trying to load

/install/sbin/kickstart.cgi

means your dhcpd.conf file is overwritten.

References:

http://archives.devshed.com/forums/networking-100/cannot-see-the-offer-and-ack-packet-with-ethereal-2063723.html

http://forums.opensuse.org/network-internet/399162-dhcp-client-identifier-matching.html

http://osdir.com/ml/network.dhcp.isc.dhcp-server/2004-05/msg00037.html

Code block to identify the vendor class identifier and other useful information:

               log(info, concat("Debug Information:\t",
               binary-to-ascii(16,8, ":", substring(hardware,1,6)),
               "\t",
               binary-to-ascii(10,8, "-", option dhcp-parameter-request-list),
               "\t",
               pick-first-value(option vendor-class-identifier,"no-identifier")
               )
               );

Python 3.0 Released

Thursday, December 4th, 2008

Read more here.

Python is one of those things that I am always excited about. It may have been the underdog compared to Perl at some point in the past, but Python now is the ubiquitous  language that is working behind the scenes for almost any application.

Python can be seen working from web servers to simple desktop applications and everything else you can think of.

MPI+Python holds a bit of an interest for me.

Some active projects:

MPI for Python

 pyMPI

pyPar

AMD Opteron claims the top 3 spots in 16 core virtualization performance benchmark VMmark

Wednesday, August 27th, 2008

AMD (NYSE: AMD) today announced it has achieved the top spot on the VMware® VMmark virtualization benchmark for x86 servers with the Quad-Core AMD Opteron processor-based HP ProLiant DL585 G5. AMD now holds the top three spots on the 16-core VMmark benchmark. This latest result is further proof that Quad-Core AMD Opteron processors provide a high-performance virtualization solution that allows data center managers to make large-scale virtualization deployments and do so at an attractive price point.

Read more here

Hello Everyone

Friday, September 28th, 2007

Hello everyone!

Welcome to our new blog. We will start sharing with you new developments regarding our  new product development, technologies and company in general.

We are excited about this and hope it will serve our esteemed customers well.