Hi Jean,
as far as I know Linux supports only software RAID 1 as boot partition
among all software RAID types/levels.
If you want stripping, LVM can be used too.
The reason for Linux to not see the raid array when you booted from the
third disk may be that you haven't updated /etc/mdadm/mdadm.conf file.
Anyway there is RAID 0 howto - http://www.flaterco.com/kb/RAID-0-root.html
HTH
Best regards
Georgi
On 02/10/2013 11:24 PM, Jean-Marc Spaggiari wrote:
Small update.
I have installed a 3rd drive to try another option. All 3 exactly the
same, 3 x 2TB.
1st drive in standard mode
Drives 2 and 3 in RAID0, splitted in 2 x 2TB folders
Installation is going weel, GRUB installed on the first disk. While
it's installating, from alt-f2 I looked at the dev folder and I'm able
to see the Volume0px files.
After restart. grub is staring correctly, but it's not able to mount
the RAID drives, and from the shell I now see only:
# ll /dev/mapper/
total 0
drwxr-xr-x 2 root root 80 fév 10 15:57 .
drwxr-xr-x 14 root root 3,4K fév 10 16:00 ..
crw------T 1 root root 10, 236 fév 10 15:57 control
brw-rw---- 1 root disk 254, 0 fév 10 15:57 isw_bchjifacf_Volume0
The Volume0px files are not there anymore.
But parted can see still them:
# parted /dev/mapper/isw_bchjifacf_Volume0
GNU Parted 2.3
Using /dev/mapper/isw_bchjifacf_Volume0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: Linux device-mapper (striped) (dm)
Disk /dev/mapper/isw_bchjifacf_Volume0: 4001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Number Start End Size File system Name Flags
1 262kB 2000GB 2000GB ext4
2 2000GB 4001GB 2001GB ext4
(parted)
# lsmod | grep raid
is not returning anything. So I tried to activate some of them.
So trying to activate some mods just in case:
# modprobe raid0
# modprobe dm-raid
But still nothing in the mapper directory...
# ls /dev/mapper/
control isw_bchjifacf_Volume0
I will try to remove everything again from the RAID and created it
back from scrach with gparted... But the goal is to be able to boot
from it...
2013/2/10, Jean-Marc Spaggiari<jean-m...@spaggiari.org>:
Hi,
I'm trying for the 2 last days to install a Debian Wheezy on a RAID0
drive but I'm facing many issues.
I have 2 x 2TB drives configured in a 4TB RAID0 drive.
I initially used the b3 net installer but it was missing the grub bios
partition.
Now, I'm using B4, starting it with dmraid=true. I'm able to see the
RAID0 drive. I'm using the automated configuration to create the / and
the /home. So far, evertything is going well.
I'm even able to install grub (which I was not able to do initially) on
Volume0.
But when I'm re-starting, grub is not able to boot on the RAID drive.
I'm getting a "dm-raid45" not found in modules.dep.
I tried to follow the steps here:
http://wiki.debian.org/DebianInstaller/SataRaid but when I'm starting
in rescue dmraid=true mode, I'm not able to see the raid partitions. I
have the drive in /dev/mapper/xxxx_Volume0, but only it. Not the
Volume0p0 to Volume0p5 entries.
I'm a bit out of idea. I don't know what to try next.
Does anyone have solved this already?
Thanks,
JM
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