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- <!DOCTYPE RefEntry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
- <refentry id="sdisklabel">
- <refmeta>
- <refentrytitle>sdisklabel</refentrytitle>
- <manvolnum>8</manvolnum>
- <refmiscinfo>sdisklabel</refmiscinfo>
- </refmeta>
- <refnamediv>
- <refname>sdisklabel</refname>
- <refpurpose>
- Create/modify disklabels on Linux/Alpha systems
- </refpurpose>
- </refnamediv>
- <!-- This is the proper SGML way, but somehow doesn't work here -->
- <refsynopsisdiv>
- <cmdsynopsis>
- <command>sdisklabel</command>
- <arg choice="plain">device</arg>
- <group choice="opt"><arg choice="plain">print</arg>
- <arg choice="plain">zero</arg>
- <arg choice="plain">sum</arg>
- </group>
- </cmdsynopsis>
- <cmdsynopsis>
- <command>sdisklabel</command>
- <arg choice="plain">device</arg>
- <arg choice="plain">size</arg>
- <arg choice="plain">partsize</arg>
- </cmdsynopsis>
- <cmdsynopsis>
- <command>sdisklabel</command>
- <arg choice="plain">device</arg>
- <arg choice="plain">partnum</arg>
- <arg choice="plain">offset</arg>
- <arg choice="plain">size</arg>
- <arg choice="plain">parttype</arg>
- </cmdsynopsis>
- </refsynopsisdiv>
- <!-- <refsect1><title>SYNOPSIS</title>
- <para>sdisklabel <parameter>drive [print|zero|sum]</parameter></para>
- <para>sdisklabel <parameter>drive size partsize</parameter></para>
- <para>sdisklabel <parameter>drive partnum offset size parttype</parameter></para>
- </refsect1> -->
- <refsect1><title>COPYRIGHT</title>
- <para>
- <application>sdisklabel</application> is Copyright (C) by Red Hat Inc. The
- author of this man page tried to track down the original author, but was
- unable to do so. A final Bugzilla entry with RedHat yielded the following
- reply:
- <quote>
- I can't track down a Bob Manson (and I cannot find any record of his association
- with Red Hat in the aboot sources), but any work he did on behalf of Red Hat
- would be property of Red Hat, and you can consider all our changes to be release
- under the GPL the same as the rest of the aboot package.</quote>
- </para>
- </refsect1>
- <refsect1><title>DESCRIPTIONS</title>
- <para>
- <indexterm><primary>sdisklabel</primary></indexterm>
- <application>sdisklabel</application>
- can be used to create partitions (called disklabels) on Linux/Alpha
- systems. You <emphasis>must</emphasis> use disklabels instead of the
- <productname>DOS</productname> type
- partitioning scheme on any hard disk which you want to boot from via SRM or
- which you want to share with <productname>HP Tru64</productname>.
- If you instead are booting from <application>milo</application>
- then you <emphasis>must not</emphasis> use disklabels on your boot hard disk.
- </para>
- <para>
- Even if you are using disklabels, it is recommended to use
- <application>fdisk</application>(8) instead
- of <application>sdisklabel</application>.
- </para>
- <para>
- <application>sdisklabel</application> also assumes
- you have a SCSI disk with 512-byte sectors,
- though it should work fine on an IDE drive as well. All sizes are
- specified on the command line in sectors.
- </para>
- <para>
- There are 8 partitions in total which are numbered from 0 to 7. They
- correspond to BSD disklabels A to H.
- Partitions have to be added sequentially, as
- <application>sdisklabel</application> won't let
- you leave empty partitions unlike many BSD disklabel programs. If you
- want this (or if you want overlapping disk labels)
- use <application>fdisk</application>(8) instead.
- </para>
- <para>
- First off, if you have an invalid disk label (you've never run
- <application>sdisklabel</application> on this disk
- before) you have to issue
- </para>
- <para>
- <command>
- sdisklabel <parameter>/dev/sda zero</parameter>
- </command>
- </para>
- <para>
- (<filename>/dev/sda</filename> is the device you're partitioning,
- substitute as appropriate).
- </para>
- <para>
- This zeros out your disk label. Only do this if you really want to
- zero your disk label. It just does it; it doesn't ask, or warn, or
- anything.
- </para>
- <para>
- The program also probably printed out the size of your disk in kb. If
- it was wrong, you now get to use the "<parameter>size xxx</parameter>"
- option along with the
- rest of these commands. The size isn't critical, it's just used to try
- and make sure you don't go past the end of the disk.
- </para>
- <para>
- Next, add your first partition. This <emphasis>doesn't</emphasis>
- start from 0, as you
- have to leave room for the boot loader and other stuff. 256K (or 512
- sectors) will be enough.
- </para>
- <para>
- Let's pretend that you want to make a 250000 kb partition starting
- from sector offset 512:
- </para>
- <para>
- <command>
- sdisklabel <parameter>/dev/sda 0 512 500000 8 print</parameter>
- </command>
- </para>
- <para>
- The last number is the filesystem type, and is currently 8 for ext2fs
- filesystems. (A different number would be used to specify an
- <productname>Tru64</productname>
- partition, for example).
- </para>
- <para>
- If all was successful, the program should print out the partition (the
- last keyword, "print", specifies that it should print the partition
- after modifying it with the previous command), and you should see
- something like
- </para>
- <para>
- <blockquote>
- <literallayout>
- ----------------------------------------------------------
- I think your disk is 528870K total size.
- If I'm wrong, override the size with the 'size num' option
- partition 0: type 8, starts sector 512, size 500000
- ----------------------------------------------------------
- </literallayout>
- </blockquote>
- </para>
- <para>
- You can then add the next partition, which would be partition 1.
- To add a second partition that is 200000 kb long, you'd run
- </para>
- <para>
- <command>
- sdisklabel <parameter>/dev/sda 1 512256 400000 8 print</parameter>
- </command>
- </para>
- <para>
- And both partitions would then be printed out.
- </para>
- <para>
- If for some reason the size got determined incorrectly, you'd do
- instead
- </para>
- <para>
- <command>
- sdisklabel <parameter>/dev/sda size 528870 0 512 400000 8 print</parameter>
- </command>
- </para>
- <para>
- The size option should come immediately after the device name, and the
- size is the total # of sectors on the drive.
- </para>
- </refsect1>
- <refsect1><title>BUGS</title>
- <para>
- <application>sdisklabel</application> does not check for all errors, so
- use with care.
- </para>
- </refsect1>
- <refsect1><title>NOTES</title>
- <para>
- If you want to share the disk with <productname>HP Tru64</productname>
- (<productname>OSF/1</productname>) it is recommended to
- use the <productname>Tru64</productname>
- partitioning tools to prepare the disk.
- </para>
- <para>
- To actually boot from the freshly labeled disk you also need to install
- a boot strap as well, see
- <application>aboot</application>(8) and <application>swriteboot</application>(8)
- for details.
- </para>
- <para>
- The print command may be placed before or after any other command.
- </para>
- <para>
- In case you do want to leave empty partitions or create labels which
- extend beyond the end of the disk (e.g., when you know
- <application>sdisklabel</application> is reporting a wrong size) then
- use can use the <parameter>force</parameter> switch on the command line.
- </para>
- </refsect1>
- <refsect1><title>AUTHOR</title>
- <para>
- This man page was written by Helge Kreutzmann <email>debian@helgefjell.de</email> for the Debian GNU/Linux project but may be used by others. It is
- heavily based on the <filename>README</filename> provided along with the
- <application>sdisklabel</application> source.
- </para>
- </refsect1>
- <refsect1><title>SEE ALSO</title>
- <para>
- <application>fdisk</application>(8), <application>aboot</application>(8), <application>swriteboot</application>(8)
- </para>
- </refsect1>
- </refentry>
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