Hi Fajar,
I would say it is basically a matter of your personal taste.
However, if you wish to extend your LVs later without too much
hassle
I would prefer initially setting up one large RAID 1 which should
serve
as one PV.
I would only separate the /boot partition to an isolated RAID 1
meta device.
Though it is possible to put /boot onto an LV I would strongly
disuade you from doing so.
The issue here is disaster recovery because you need a specially
tuned kernel and
initial ramdisk that can cope with loading the kernel from a
/boot LV,
which the recovery mode of your distro's install CD usually
doesn't provide.
Btw, for the same reason I found the ubiquitious Knoppix live CDs
practically useless
for my Linux boxes.
So in /etc/fstab I would set
/dev/mdo /boot ...
as mountpoint.
Then, assuming you built a big enough /dev/md1 to host /, /usr,
/var, /tmp, /home
I would create a root VG from one big PV
e.g.
# pvcreate /dev/md1
# vgcreate -s 16 -p 8 -l 64 vgroot /dev/md1
And then create your LVs al gusto
e.g.
# lvcreate -L 512m -n lv_root vgroot # if you're afraid you
could increase / to 1G but usually 512m should suffice
# lvcreate -L 3072m -n lv_usr vgroot # depending on the
amount of binaries you install, cave kernel sources
# lvcreate -L 2048m -n lv_var vgroot # for a web or mail
server producing large spools and logs set high
# lvcreate -L 512m -n lv_tmp vgroot
# lvcreate -L 1024m -n lv_opt vgroot # some non-OS binaries
like Fedora's Directory Server install here
# lvcreate -L 2048m -n lv_home vgroot # depending on how many
users you host
Then create filesystems al gusto
# vgdisplay -v vgroot|awk '/LV Name/{print$NF}'|xargs -n1
mkfs.ext3
If you run out of PEs and you need to increase any LV you can at
any time
add other RAID1 devs
e.g. you have spare md2 md3 md4
vgextend vgroot /dev/md[2-4]
and then
lvextend -L +4092m /dev/vgroot/lv_home
ext2online /dev/vgroot/lv_home
HTH
Ralph
-----Original Message-----
From: fedora-list-bounces(a)redhat.com
[mailto:fedora-list-bounces@redhat.com]On Behalf Of Fajar
Priyanto
Sent: Thursday, March 02, 2006 12:47 PM
To: For users of Fedora Core releases
Subject: Advice on setting up Raid and LVM
Hi all,
I'm setting up Raid 1 and LVM on 2x80GB SATA drives.
The partition scheme is like this:
/boot = 300MB
/ = 9.2GB
/home = 70GB
swap = 500MB
The RAID is RAID 1.
md0 = 300MB = /boot
md1 = 9.2GB = LVM
md2 = 70GB = LVM
md3 = 500MB = LVM
Now, the confusing part is:
1. When creating VolGroup00, should I include all PV (md1,
md2, md3)? Then
create the LV.
2. When setting up RAID 1, should I make those separated
partitions
for /, /home, and swap? Or, should I just make one big RAID
device?
The future purpose of using LVM is I want to be able to
expand any partitions
that would run out of space into a new disk.
Thank you very much.
--
Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial
http://linux2.arinet.org
18:35:53 up 4:55, 2.6.15-1.1830_FC4 GNU/Linux
Let's use OpenOffice.
http://www.openoffice.org
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