Attachment 1141 Details for Bug 3025 – the xml source

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gentoo LVM Installation.xml (text/plain), 8.24 KB, created by Thilo Bangert (RETIRED) (RETIRED) on 2002-05-25 10:46:16 UTC

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><?xml version='1.0'?>
><guide>
><title>Gentoo LVM installation</title>
><author title="Author"><mail link="avi@CFFtechnologies.com">Avi Schwartz</mail></author>
>
><abstract>In this guide I describe how I setup my Gentoo machine using the Logical Volume Manager(LVM).
>While all examples are from my specific installation, it may serve as a starting
>point to your own installation.
></abstract>
>
><version>1.0</version>
><date>4 May 2002</date>
>
><chapter>
>	<title>Preface</title>
>	<body>
>		This guide describes my experience in setting up my specific Gentoo 
>		system using the Logical Volume Manager (LVM). This means that you
>		will more then likely need to change the drive, partition names and 
>		partition sizes to match your own setup and needs.
>
>		<impo>
>			This document is not intended to be an LVM tutorial. It serves as a
>			supplement to the Gentoo installation document and as such it references 
>			steps in the general installation guide. Make sure to read the Gentoo
>			Installation Guide before you start your installation process.
>		</impo>
>
>		<note>For a complete LVM HOWTO point your browser to 
>		 <uri>http://www.sistina.com/lvm_howtos/lvm_howto</uri>/</note>
>	</body>
>
>	<section>
>		<title>Partitions</title>
>		<body>
>			I have 2 SCSI drives, each 36 GB in size and a third drive which
>			is IDE and is 100 GB in size. In this example, I am not using the 
>			IDE drive since my plan is to move its data to LVM before I 
>			reformat it and add it to the volume group.
>
>			The partition names on my system are:
>
>			<ul>
>				<li>/dev/sda1 -- /boot</li>
>				<li>/dev/sda2 -- /</li>
>				<li>/dev/sda3 -- Will be used by LVM</li>
>				<li>/dev/sdb1 -- Will be used by LVM</li>
>			</ul>
>
>			OK, time to start...
>		</body>
>	</section>
></chapter>
>
><chapter><title>Installation</title>
><body>
><ol>
> <li>
>	Go through steps 1 - 5 of the installation guide.
> </li>
>
> <li>
>	Steps 3 - 9 of this document replace step 6 (Set up partitions) of the installation guide.
> </li>
>
> <li>
>	Create a small physical /boot partition. In this example, /boot will be 
> 	not managed by LVM. This partition will contain your booting kernel and 
> 	Grub. I created a 100 MB partition, enough for quite a few kernel 
> 	generations.
> </li>
>
> <li>
>	Create a / (root) partition. If you are interested in trying to put your
> 	root partition under LVM management, see the resources section at the end
> 	for a link to a mini-howto on how to do this. The size of the root 
> 	partition need not be large if you will keep /opt /usr /home /var and 
> 	/tmp in an LVM Volume Group (vg).
>
> 	<note>
>		I would also recommend NOT to put the following directories in an 
> 	 	LVM partition:
>		<ul>
>			<li>/etc</li>
>			<li>/lib</li>
>			<li>/mnt</li>
> 			<li>/proc</li>
>			<li>/sbin</li>
>			<li>/dev</li>
>			<li>/root</li>
>		</ul>
>
> 		This way, you would still be able to log into your system (crippled, but 
> 		still somewhat usable, as root) if something goes terribly wrong.
> 	</note>
> </li>
>
> <li>
>	Assuming the /boot and root partitions do not use the whole physical disk,
> 	create a third partition on this disk and set it to type 8e (Linux LVM).
> 	If you have more physical drives you would like to use with LVM, create 
> 	one partition on each and give them the same type (8e).
>
> 	<note>You can also prepare a whole device instead of a partition.</note>
> </li>
>
> <li>
>	Prepare the partitions.
>
><pre>
>pvcreate /dev/sda3
>pvcreate /dev/sdb1
></pre>
> </li>
>
> <li>
>	Setup a volume group.
> 	<impo>
>		vgcreate does not recognize links pointing to the physical
> 		partition therefore use
>
><pre>
>ls -l /dev/hd* and or /dev/sd*
></pre>
>
> 		to find out the actual devices.
>	</impo>
>
> 	In my case /dev/sda1 and /dev/sda2 are
> 	the /boot and root partitions so I care only about /dev/sda3 and /dev/sdb1.
> 	/dev/sda3 points to /dev/scsi/host1/bus0/target0/lun0/part3 and
> 	/dev/sdb1 points to /dev/scsi/host1/bus0/target1/lun0/part1. Therefore my
> 	vgcreate will look as follows:
>
><pre>
>vgcreate vg /dev/scsi/host1/bus0/target0/lun0/part2 \
> /dev/scsi/host1/bus0/target1/lun0/part1
></pre>
> </li>
>
> <li>
>	Create the logical volumes. Logical volumes are the equivalent of 
> 	partitions you create using fdisk in a non LVM environment. In my example
> 	I create the following partitions:
>
> 	<table>
> 	<tr>
>		<th>Directory</th>
>		<th>Size</th>
> 	</tr>
> 	<tr>
>		<ti>/usr</ti><ti>10 GB</ti>
> 	</tr>
> 	<tr>
>		<ti>/home</ti><ti>5 GB</ti>
> 	</tr>
> 	<tr>
>		<ti>/opt</ti><ti>5 GB</ti>
> 	</tr>
> 	<tr>
> 	<ti>/var</ti><ti>10 GB</ti>
> 	</tr>
> 	<tr>
>		<ti>/tmp</ti><ti>2 GB</ti>
> 	</tr>
> 	</table>
>
> 	Since I was going to use LVM, I didn't worry too much about partition
> 	sizes since I can always move space around as needed.
>
> 	<note>
>		Terje Kvernes commented correctly, that it is easier to increase the
>		size of a partition then to shrink it. You might want therefore to start
> 		with smaller partitions and increase their size as needed.
>	</note>
>
> 	<note>
>		I also created a swap partition on LVM. You will be probably better off
> 		not using LVM for swap, but I felt I had to try it :-)
>	</note>
>
><pre>
>lvcreate -L10G -nusr vg
>lvcreate -L5G -nhome vg
>...
>lvcreate -L2G -ntmp vg
></pre>
> </li>
>
> <li>
>	Format the logical volumes the same way you format a regular partition:
> 
> 	First, lets take care of the swap logical volume:
>
><pre>
> mkswap /dev/vg/swap
></pre>
>
> 	I am using ext3 on the rest of the logical volumes:
>
><pre>
> mke2fs -j /dev/vg/usr
> ...
></pre>
>
> 	<note>
>		The rest of the installation document is mostly unchanged so I will not
> 		walk you through it again except to point differences.
>	</note>
> </li>
>
> <li>
>	Follow step 7 (Mount partitions) of the installation document exchanging
> 	/dev/vg/partition_name for /dev/hdxx (except of course for the boot and
> 	root partitions since they are not on a LVM).
> </li>
>
> <li>
>	Step 14 (Final steps: kernel and system logger) - Make sure to configure
> 	your kernel to support LVM. You can find this option in the entry named
>
> 	Multi-device support (RAID and LVM)
>
> 	also make sure to merge the lvm-user package.
> </li>
>
> <li>
>	Step 16 (Final steps: /etc/fstab) - Add your LVM partitions to /etc/fstab
> 	as needed. Again, here are few lines from my machine:
>
><pre>
>/dev/sda1 /boot ext3 noauto,noatime 1 1
>/dev/sda2 / ext3 noatime 0 0
>/dev/vg/opt /opt ext3 noatime 0 0
>/dev/vg/usr /usr ext3 noatime 0 0
>...
></pre>
>
> 	If you configured LVM as a module when you configured the kernel, add to 
> 	your /etc/modules.autoload the line
>
><pre>
>lvm-mod
></pre>
> </li>
>
> <li>
>	Step 17 (Installation complete!) - Don't forget to umount all your LVM 
> 	partitions as well and for a good measure run the following command before
> 	you reboot:
>
><pre>
>vgchange -an
></pre>
> </li>
>
> <li>
>	Reboot your machine, but be warned that the boot process will likely give
> 	you many error messages since the localmount script will fail to
> 	recognize the fact that LVM is in use. Once you log into your system, 
> 	issue the following command:
>
><pre>
>vgscan
></pre>
>
> This will generate the /etc/lvmtab that the localmount script uses to
> check if it should start LVM. Restart your machine and now all
> partitions should be visible and mounted.
> </li>
></ol>
></body>
></chapter>
>
><chapter>
>	<title>Resources</title>
>	<body>
>		The LVM Howto:
>		<uri>http://www.sistina.com/lvm_howtos/lvm_howto/</uri>
>		Daniel Robbins' articles on LVM at IBM's DeveloperWorks:
>		<uri>http://www-106.ibm.com/developerworks/linux/library/l-lvm/?dwzone=linux</uri>
>		<uri>http://www-106.ibm.com/developerworks/linux/library/l-lvm2.html?dwzone=linux</uri>
>		How to boot your root FS off of LVM:
>		<uri>http://www.the-infinite.org/archive/docs/lvm/howto-boot-off-root-lv.txt</uri>
></body>
></chapter>
>
><chapter>
>	<title>Acknowledgements</title>
>	<body>
>		I would like to thank <mail link="bangert@gentoo.org">Thilo Bangert</mail>
>		and <mail link="terjekv@math.uio.no">Terje Kvernes</mail> for their help 
>		and comments on this document.
>	</body>
></chapter>
></guide>

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