Help needed plz

Help needed plz

[Philippe Dhont (Sea-ro)]

Hi all,

I am new to softraid so i first readed some info about it and i also have
the book "managing raid on linux."
I don't want to use a pre-installed raid (like in suse or redhat etc...) but
i want to do it from my slackware8.1 installation, from scratch!
But there are some things not clear.
This is the situation:
I have a ATA-hda and a ATA-hdc (only 2 disks)
My linux is installed on HDA and everything works fine, i recompiled the
kernel and raid-drivers a succesfully started, the raidtools are also fine.
But now some questions, maybe stupid but it's a different with hardware raid
and i really want to know it.

1) i can't do a mkraid /dev/md0   ==> i get the message that hda1 (my
current installation is on hda1 and everything else, i also boot from it) is
already mounted so i guess this is normal but if i change "hda1 to hda" and
"hdb1 to hdb" in the raidtab then everything works and it synchronizes (can
see it in /proc/mdstat).
But this synchronizes only once, i want to boot from md0 and this is of
course not possible in this situation, it always boots from hda1.
How do i have to boot from md0 ?? Do i have to make a raid1 with 3 disks ??
Or how do i have to do it ? I don't understand this part !!
1 installation disk and two disks for the raid1 and then install a system on
the raid1 ??
And later on remove the install disk i first installed the raid arrey with ?

2)How do i have to install a linux on a md0 ? Do i start with the cd or
something ?
Never did it before.


Thnx for the help, just put me on the way!!
I tried before but i crashed my hdd's already twice !!
But you have to start somewhere, right ?

thnx
Philippe Dhont 

RE: Help needed plz

[Shaw, Marco]

http://en.tldp.org/HOWTO/Software-RAID-HOWTO.html

> -----Original Message-----
> From: Philippe Dhont (Sea-ro) [mailto:Philippe.Dhont@searo.be] 
> Sent: Thursday, February 06, 2003 11:16 AM
> To: 'linux-raid@vger.kernel.org'
> Subject: Help needed plz
> 
> 
> Hi all,
> 
> I am new to softraid so i first readed some info about it and 
> i also have the book "managing raid on linux." I don't want 
> to use a pre-installed raid (like in suse or redhat etc...) 
> but i want to do it from my slackware8.1 installation, from 
> scratch! But there are some things not clear. This is the 
> situation: I have a ATA-hda and a ATA-hdc (only 2 disks) My 
> linux is installed on HDA and everything works fine, i 
> recompiled the kernel and raid-drivers a succesfully started, 
> the raidtools are also fine. But now some questions, maybe 
> stupid but it's a different with hardware raid and i really 
> want to know it.
> 
> 1) i can't do a mkraid /dev/md0   ==> i get the message that hda1 (my
> current installation is on hda1 and everything else, i also 
> boot from it) is already mounted so i guess this is normal 
> but if i change "hda1 to hda" and "hdb1 to hdb" in the 
> raidtab then everything works and it synchronizes (can see it 
> in /proc/mdstat). But this synchronizes only once, i want to 
> boot from md0 and this is of course not possible in this 
> situation, it always boots from hda1. How do i have to boot 
> from md0 ?? Do i have to make a raid1 with 3 disks ?? Or how 
> do i have to do it ? I don't understand this part !! 1 
> installation disk and two disks for the raid1 and then 
> install a system on the raid1 ?? And later on remove the 
> install disk i first installed the raid arrey with ?
> 
> 2)How do i have to install a linux on a md0 ? Do i start with 
> the cd or something ? Never did it before.
> 
> 
> Thnx for the help, just put me on the way!!
> I tried before but i crashed my hdd's already twice !!
> But you have to start somewhere, right ?
> 
> thnx
> Philippe Dhont 
> -
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