566 lines
9.2 KiB
HTML
566 lines
9.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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>Setting up LVM on three SCSI disks with striping</TITLE
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><TH
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>LVM HOWTO</TH
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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>Prev</A
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><TD
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WIDTH="80%"
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>Chapter 13. Recipes</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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><A
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HREF="recipeadddisk.html"
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ACCESSKEY="N"
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>Next</A
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WIDTH="100%"></DIV
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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="recipethreescsistripe"
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></A
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>13.2. Setting up LVM on three SCSI disks with striping</H1
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><P
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> For this recipe, the setup has three SCSI disks that will be put
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into a logical volume using LVM. The disks are at /dev/sda,
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/dev/sdb, and /dev/sdc.
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</P
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><DIV
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CLASS="note"
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><P
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></P
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><TABLE
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CLASS="note"
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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/note.gif"
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HSPACE="5"
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ALT="Note"></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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>Note</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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> <STRONG
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> It is not currently possible to add a disk to a
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striped logical volume in LVM 1. Use LVM 2 with the
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lvm 2 format metadata if you wish to be able to do
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so able to do so.
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</STRONG
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>
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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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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1106"
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></A
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>13.2.1. Preparing the disk partitions</H2
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><P
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> Before you can use a disk in a volume group you will have to
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prepare it:
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</P
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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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>Warning!</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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> <STRONG
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> The following will destroy any data on /dev/sda, /dev/sdb,
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and /dev/sdc
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</STRONG
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>
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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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><P
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> Run pvcreate on the disks:
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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/sda
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# pvcreate /dev/sdb
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# pvcreate /dev/sdc</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 area (VGDA) at the start
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of the disks.
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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1116"
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></A
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>13.2.2. Setup a Volume Group</H2
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><P
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></P
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><OL
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TYPE="1"
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><LI
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><P
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> Create a volume group
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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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># vgcreate my_volume_group /dev/sda /dev/sdb /dev/sdc</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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</P
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></LI
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><LI
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><P
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> Run vgdisplay to verify volume group
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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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># vgdisplay</B
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>
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<TT
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CLASS="computeroutput"
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>--- Volume Group ---
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VG Name my_volume_group
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VG Access read/write
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VG Status available/resizable
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VG # 1
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MAX LV 256
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Cur LV 0
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Open LV 0
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MAX LV Size 255.99 GB
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Max PV 256
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Cur PV 3
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Act PV 3
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VG Size 1.45 GB
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PE Size 4 MB
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Total PE 372
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Alloc PE / Size 0 / 0
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Free PE / Size 372/ 1.45 GB
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VG UUID nP2PY5-5TOS-hLx0-FDu0-2a6N-f37x-0BME0Y</TT
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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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The most important things to verify are that the first
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three items are correct and that the VG Size item is the
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proper size for the amount of space in all four of your
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disks.
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</P
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></LI
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></OL
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1128"
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></A
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>13.2.3. Creating the Logical Volume</H2
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><P
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> If the volume group looks correct, it is time to create a
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logical volume on top of the volume group.
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</P
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><P
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> You can make the logical volume any size you like (up to the
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size of the VG you are creating it on; it is similar to a
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partition on a non LVM setup). For this example we will create
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just a single logical volume of size 1GB on the volume group.
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The logical volume will be a striped set using for the 4k stripe
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size. This should increase the performance of the logical
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volume.
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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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># lvcreate -i3 -I4 -L1G -nmy_logical_volume my_volume_group</B
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>
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<TT
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CLASS="computeroutput"
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>lvcreate -- rounding 1048576 KB to stripe boundary size 1056768 KB / 258 PE
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lvcreate -- doing automatic backup of "my_volume_group"
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lvcreate -- logical volume "/dev/my_volume_group/my_logical_volume" successfully created</TT
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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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</P
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><DIV
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CLASS="note"
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><P
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></P
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><TABLE
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CLASS="note"
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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/note.gif"
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HSPACE="5"
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ALT="Note"></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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>Note</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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> If you create the logical volume with a '-i2' you will only
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use two of the disks in your volume group. This is useful if
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you want to create two logical volumes out of the same
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physical volume, but we will not touch that in this recipe.
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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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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1138"
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></A
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>13.2.4. Create the File System</H2
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><P
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> Create an ext2 file system on the logical volume
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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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># mke2fs /dev/my_volume_group/my_logical_volume</B
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>
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<TT
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CLASS="computeroutput"
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>mke2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
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Filesystem label=
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OS type: Linux
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Block size=4096 (log=2)
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Fragment size=4096 (log=2)
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132192 inodes, 264192 blocks
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13209 blocks (5.00%) reserved for the super user
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First data block=0
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9 block groups
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32768 blocks per group, 32768 fragments per group
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14688 inodes per group
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Superblock backups stored on blocks:
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32768, 98304, 163840, 229376
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Writing inode tables: done
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Writing superblocks and filesystem accounting information: done</TT
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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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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1144"
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></A
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>13.2.5. Test the File System</H2
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><P
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> Mount the file system on the logical volume
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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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># mount /dev/my_volume_group/my_logical_volume /mnt</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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and check to make sure everything looks correct
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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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># df</B
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>
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<TT
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CLASS="computeroutput"
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>Filesystem 1k-blocks Used Available Use% Mounted on
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/dev/hda1 1311552 628824 616104 51% /
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/dev/my_volume_group/my_logical_volume
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1040132 20 987276 0% /mnt</TT
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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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If everything worked properly, you should now have a logical
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volume mounted at <TT
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CLASS="filename"
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>/mnt</TT
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>.
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</P
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VALIGN="top"
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>Setting up LVM on three SCSI disks</TD
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>Add a new disk to a multi-disk SCSI system</TD
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