[gentoo-user] Re: [OT] Moving system from "single-disk" to RAID-1 configuration

[Francesco Talamona]

On Sunday 23 October 2005 15:53, Dan Johansson wrote:
> Hi,
>
> I have a setup Gentoo on a Box with a onboard ATA Raid controller
> (Promise PDC20265 FastTrak100 Lite/Ultra100). At the moment I am only
> using one ATA-Disk on this controller (this is the only disk in the
> system). Now I want to add a second Disk to this system and setup a
> RAID-1 configuration. Can someone point me to a good HOWTO or
> something similar which describes how to setup this
> (grub/lilo/dm/...) on a 2.6 kernel.
>
> Regards,

Many howtos mix raidtools and mdadm, this one [1] IMO is much clear.

At the moment I'm running a system with a RAID1 for /boot and another 
RAID1 for root, and a LVM2 on top of a RAID5 for everything else. [3]

The most difficult thing was making disc naming sticky, I have a ASUS 
A8V with a Via and a Promise controller, and the disk naming was so 
sloppy that if sda failed all other disks were renamed to accommodate 
in the free namespace, not at all reliable!
See [2]. 

In the end, after udev fine tuning, I managed to build a degraded array 
of 4 disks using 3 discs (the RAID1 for /boot was built with 3 of 3 
from the start) using instruction and suggestion in [1], no need 
for /etc/raidtab!

A livecd that recognizes your hardware and has mdadm, lvm... is an 
invaluable rescue tool, test it before all.

[1]http://www.linuxdevcenter.com/pub/a/linux/2002/12/05/RAID.html
[2]http://forum.hardware.fr/hardwarefr/OSAlternatifs/RAID-Soft-SATA-SCSI-Les-disques-changent-resolu-sujet-51807-1.htm
[3]http://www.gentoo.org/doc/en/lvm2.xml

ciao
	Francesco
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Linux Version 2.6.12-gentoo-r9, Compiled #2 Wed Aug 24 18:43:16 CEST 
2005
One 2.2GHz AMD Athlon 64 Processor, 2GB RAM, 4325.37 Bogomips Total
aemaeth
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