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Generating/Rework of ALPHA OSF/1 disklabel with FDISK v2.12r
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ali_baba_in_alpha_caves
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Joined: 20 Feb 2011
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PostPosted: Mon Feb 21, 2011 9:43 am    Post subject: Generating/Rework of ALPHA OSF/1 disklabel with FDISK v2.12r Reply with quote

Hello,

In an attempt to start partitioning of an AlphaServer, in order to install Gentoo Linux on a second partition, I got into trouble with FDISK v2.12r
Now ABOOT does not recognise a valid partition table anymore. Removing the OpenVMS partition would not be a problem, but I want ultimately both OpenVMS and Gentoo to coexist.

The original partition table was made using OpenVMS, and FDISK was showing the following information prior to start:
Code:
livecd root # fdisk /dev/sda
Detected an OSF/1 disklabel on /dev/sda, entering disklabel mode.

BSD disklabel command (m for help): p

4 partitions:
#       start       end      size     fstype   [fsize bsize   cpg]
  a:        6      4101      4096       << Original OpenVMS partition
  b:     4102      8197      4096       ext2 << Targeted for Gentoo
  c:     8198     10245      2048       swap
  d:    10246     35004*    24758*      ext2 << Important data useful for the Gentoo installation


In an attempt to bootstrap the harddrive, using the fdisk i command, as follow
Code:
livecd root # cp sda1/boot/bootlx sda1/usr/ucb/mdec/sdboot
livecd root # chroot sda1
sh-3.1# cp usr/ucb/mdec/sdboot usr/ucb/mdec/bootsd
sh-3.1# fdisk /dev/sda
Detected an OSF/1 disklabel on /dev/sda, entering disklabel mode.

BSD disklabel command (m for help): i
Bootstrap: sdboot -> bootsd (sd):
 ... /usr/ucb/mdec/sdboot
 ... /usr/ucb/mdec/bootsd
Bootstrap installed on /dev/sda.

Syncing disks.

BSD disklabel command (m for help): q


Question.
How to recover from this fdisk i-command ? I am willing to keep the OSF/1 disklabel, because OpenVMS may get into trouble with the DOS partition table, to which only Linux is compatible.

Many Thanks
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ali_baba_in_alpha_caves
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Joined: 20 Feb 2011
Posts: 9

PostPosted: Tue Feb 22, 2011 5:06 pm    Post subject: Reply with quote

Finaly I could recover the partition of my harddrive.

Luckily, I had the data regarding the placement of the partitions. This is very recommandable to keep the new partition scheme consistant with the scraped partition table. This waz, I did not even loose any data. Great!

So, now I have my BSD partition table back.

Any idea what is this bootstrap command i with FDISK ?
This special modes are not documented in the man pages, and not clarified in the Gentoo Handbook.
Somebody has a clue, is this a replacement for SWRITEBOOT and ABOOTCONF ?

Many thanks
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