330 lines
5.0 KiB
HTML
330 lines
5.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Initializing disks or disk partitions</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="LVM HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Common Tasks"
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HREF="commontask.html"><LINK
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REL="PREVIOUS"
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TITLE="Common Tasks"
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HREF="commontask.html"><LINK
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REL="NEXT"
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TITLE="Creating a volume group"
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HREF="createvgs.html"></HEAD
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CLASS="sect1"
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COLSPAN="3"
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ALIGN="center"
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>LVM HOWTO</TH
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></TR
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WIDTH="10%"
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>Prev</A
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><TD
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WIDTH="80%"
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VALIGN="bottom"
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>Chapter 11. Common Tasks</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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>Next</A
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="initdisks"
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></A
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>11.1. Initializing disks or disk partitions</H1
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><P
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> Before you can use a disk or disk partition as a physical volume
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you will have to initialize it:
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</P
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><P
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> For entire disks:
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<P
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></P
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><UL
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><LI
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><P
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> Run pvcreate on the disk:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># pvcreate /dev/hdb</B
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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This creates a volume group descriptor at the start of
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disk.
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<DIV
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CLASS="warning"
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><P
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></P
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><TABLE
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CLASS="warning"
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WIDTH="100%"
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BORDER="0"
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><TR
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><TD
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WIDTH="25"
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ALIGN="CENTER"
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VALIGN="TOP"
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><IMG
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SRC="../images/warning.gif"
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HSPACE="5"
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ALT="Warning"></TD
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><TH
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ALIGN="LEFT"
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VALIGN="CENTER"
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><B
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>Not Recommended</B
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></TH
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></TR
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><TR
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><TD
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> </TD
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><TD
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ALIGN="LEFT"
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VALIGN="TOP"
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><P
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> Using the whole disk as a PV (as opposed to a partition spanning the whole disk) is not recommended because of the management issues it can create. Any other OS that looks at the disk will not recognize the LVM metadata and display the disk as being free, so it is likely it will be overwritten. LVM itself will work fine with whole disk PVs.
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</P
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></TD
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></TR
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></TABLE
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></DIV
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>
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</P
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></LI
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><LI
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><P
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> If you get an error that LVM can't initialize a
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disk with a partition table on it, first make sure
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that the disk you are operating on is the correct
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one. If you are very sure that it is, run the
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following:
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<DIV
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CLASS="warning"
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><P
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></P
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><TABLE
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CLASS="warning"
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WIDTH="100%"
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BORDER="0"
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><TR
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><TD
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WIDTH="25"
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ALIGN="CENTER"
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VALIGN="TOP"
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><IMG
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SRC="../images/warning.gif"
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HSPACE="5"
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ALT="Warning"></TD
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><TH
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ALIGN="LEFT"
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VALIGN="CENTER"
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><B
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>DANGEROUS</B
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></TH
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></TR
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><TR
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><TD
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> </TD
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><TD
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ALIGN="LEFT"
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VALIGN="TOP"
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><P
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> The following commands will destroy the
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partition table on the disk being operated on.
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Be very sure it is the correct disk.
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</P
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></TD
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></TR
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></TABLE
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></DIV
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>
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> # dd if=/dev/zero of=/dev/diskname bs=1k count=1
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# blockdev --rereadpt /dev/diskname
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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></LI
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></UL
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>
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For partitions:
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<P
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></P
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><UL
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><LI
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><P
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> When using LVM 1 on PCs with DOS partitions, set
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the partition type to 0x8e using fdisk or some
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other similar program. This step is unnecessary
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on PPC systems or when using LVM 2.
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</P
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></LI
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><LI
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><P
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> Run pvcreate on the partition:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># pvcreate /dev/hdb1</B
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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This creates a volume group descriptor at the start of
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the /dev/hdb1 partition.
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</P
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></LI
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></UL
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>
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</P
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></DIV
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CLASS="NAVFOOTER"
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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HREF="commontask.html"
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ACCESSKEY="P"
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>Prev</A
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HREF="index.html"
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HREF="createvgs.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
|
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VALIGN="top"
|
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>Common Tasks</TD
|
|
><TD
|
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="commontask.html"
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>Up</A
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
|
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>Creating a volume group</TD
|
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></TR
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></TABLE
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></BODY
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> |