Sunday, December 23, 2007

Recover the Linux Boot Loader (Grub)

Most of the Linux users who are using multiple operating systems installations in a single hard drive. Many of them (Especially those of Microsoft's) have to encounter the erasure and re-writing of MBR (Master Boot Record) after re-installing or fresh installing Windows after Linux. This situation is very frustating as despite the Linux partition being intact, one has to reinstall the Linux distribution everytime after installation of Windows.
By issuing the below commands, one can retrieve his/her previous Grub Bootloader screen in 6 easy steps.
  • You need a bootable Linux CD (Preferably a live CD)
  • Please note that the Linux partiton for which you are going to recover the MBR should be installed on an un-encrypted filesystem
  • Boot with the bootable linux CD
  • Invoke the shell
  • Give the following commands
  • # grub (This will drop you on the grub prompt)
  • grub>geomettry (hd0) (Your Primary Hard Drive. Determine the Linux Partition number say "n")
  • grub>root (hd0,n) ("n" is your linux partition searched by the previous command)
  • grub>setup (hd0,n)/boot/grub/menu.lst
  • quit

Voila!!.... just restart your computer and find your previous MBR restored!!

Sunday, December 16, 2007

All new Top500 along with one at India in Top5

The latest Top500 list was rejuvinated with a never before 478.2 TFop/s delivered by as ususal much discussed the BlueGene/L System, (a joint development of IBM and the Department of Energy's (DOE) National Nuclear Security Administration (NNSA) and installed at DOE's Lawrence Livermore National Laboratory in Livermore, the United States) breaking its own record of 280.6 TFop/s. There were many new players seen sucha as for the first time ever, India placed a system in the Top 10. The Computational Research Laboratories, a wholly owned subsidiary of Tata Sons Ltd. in Pune, India, installed a Hewlett-Packard Cluster Platform 3000 BL460c system. achieved 117.9 TFlop/s performance.
The Top5 list as follows:
United States

3 SGI/New Mexico Computing SGI Altix ICE 8200, Xeon quad SGI
Applications Center (NMCAC)
United States
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