Rodney Oliver on 1 Sep 2005 00:44:09 -0000

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RE: [PLUG] hard disk partitioning

Thanks for the advice,  especially about the /boot directory.  This is my
first attempt at LVM volumes on a raid array and I'm testing it out on an
old Intel workstation in my office. So, I'll just use software raid for now.
Here is another question:

The workstation I'm attempting this on has two hard drives hda and hdb.  hda
is an 80gb drive and hdb is a 115gb drive.  I created a 2gb /boot partition
on hda1, then used the rest of the free space as the RAID partition.  On hdb
I used the entire disk as my second RAID partition.  I then created a RAID 1
md0 from of both those drives.  Here is where I get lost.  When I create the
RAID1 array md0 it only shows 77564mb of space available in the md0 array.
I'm positive I included both drives in the array. Shouldn't the space be
more like (77567 + 114471)192035mb? Anyone have any thoughts?  What am I

Thanks for your help!

-----Original Message-----
[] On Behalf Of Jason
Sent: Tuesday, August 30, 2005 8:04 AM
To: Philadelphia Linux User's Group Discussion List
Subject: Re: [PLUG] hard disk partitioning

On 8/30/05, Rodney Oliver <> wrote:
> Hi all,
> Is it possible to create a RAID 1 array using two drives then LVM those
> drives?  If so where can I find some good documentation with example
> partitioning schemes?

Assuming you mean using Liinux software raid, sure, you can do that.

When you create your LVM volume, instead of using a physical
partition, like say /dev/hda2, you'll just reference an md device,
like say /dev/md0.

While it may be technically possible to raid your /boot, I'd recommend
you save the headaches and not bother with it.  Same for swap, don't
use a raid for swap.

If you're really serious about building it out "the right way", go
with a single drive that will house /boot and swap space, smallish,
like 2-4 gb.  Add to that a hardware raid adapter and the drives.  You
can use LVM on the RAID volume.  Most distros seem to just make 3
partitions these days, /boot, / and swap.  There are plenty of reasons
to splinter the filesystem further, such as keeping /var and / apart
from /home so that user activity won't crash the box if they run their
filesystem out of space.

It really depends on how the box is being used.  The best advice I
could give about this?  Think.  Think some more.  When you're done -
think again.  You'll be glad you planned it all out down the line.
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