[Centos] raid mirroring on existing CentOS 4 installation?

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Greetings

I have a simple Intel 865PERL motherboard and 1.8GHz processor test server
w/ CentOS 4 on it. It was upgraded from 3.3 to 3.4 then "linux upgradeany"
to 4.0.

Ok, I started with one 40G PATA WD hard drive (/dev/hda) and just added a
second identical drive on the slave controller and it is (/dev/hdc)

I think /dev/hdb is the DVD/CDROM

Here is the first drive /dev/hda on my test box.

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda1              1004024    361112    591908  38% /
/dev/hda6              5036284     35016   4745436   1% /home
/dev/hda7              5036284     34920   4745532   1% /home/vpopmail
none                    517520         0    517520   0% /dev/shm
/dev/hda5              5218040     32924   4920048   1% /tmp
/dev/hda2             10080520   4143052   5425400  44% /usr
/dev/hda3             10080520    280508   9287944   3% /var

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1         127     1020096   83  Linux
/dev/hda2             128        1402    10241437+  83  Linux
/dev/hda3            1403        2677    10241437+  83  Linux
/dev/hda4            2678        4865    17575110    f  W95 Ext'd (LBA)
/dev/hda5            2678        3337     5301418+  83  Linux
/dev/hda6            3338        3974     5116671   83  Linux
/dev/hda7            3975        4611     5116671   83  Linux
/dev/hda8            4612        4865     2040223+  82  Linux swap

Ok, so... can I upgrade to mirroring on the fly? Is there a specific URL I
should be learning from on this?

When I get tired of this playpen and go to a fresh "test" install, what
mirroring install facts and knowledge should I be following at that time
please?

In the very near future, I want to go to a large spin fast read/write hot
swap RAID architecture. Sooooooooooo...

Do you folks have any recommendations as to what URL's I should be looking
at in the future for going to my long term goal of SATA RAID5 with an
aftermarket controller like 3ware or other CentOS happy hardware RAID
controllers?

Thank you in advance for your time.

 - rh




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