[arch-general] Software RAID installation problems

[Baho Utot]

On Wed, 2009-07-22 at 15:36 -0400, Samuel Baldwin wrote:
> On Wed, Jul 22, 2009 at 6:37 AM, Gerhard Brauer<gerhard.brauer at web.de> wrote:
> > Not sure if i understand: You don't boot from the raid arrays, correct?
> > These are only data or whatever arrays which you mount to /mnt/mdX?
> 
> Correct.
> 
> > Have you put your raid module (raid1) in /etc/rc.conf->MODULES and have
> > you put your array specs into /etc/mdadm.conf?
> 
> Ach, that I did not do. I also messed up and didn't mdadm -D --scan >>
> /etc/mdadm.conf after installing (which I did beforehand by accident,
> blindly following the guide I was reading, heh). What's the difference
> between that and -E -s?
> 
> > Also the partition types should be *fd* on all raid array members.
> 
> What? I have /dev/md0 and /dev/md1 as 'ext4' type. That's bad?
> 

That's the filesystem on the raid array.

The partition type should be fd... you set that using fdisk
The fd tells a system that the partition is part of a raid array.
You should set it on all the partitions that makeup md0 and md1

Here is the output from sudo fdisk -l

Notice under the Id column the fd type

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xef52ef52

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1       12748   102398278+   7  HPFS/NTFS
/dev/sdb2           12749       12814      530145   83  Linux
/dev/sdb3           12815       12880      530145   82  Linux swap /
Solaris
/dev/sdb4           12881       60801   384925432+   5  Extended
/dev/sdb5           12881       14186    10490413+  fd  Linux raid
autodetect
/dev/sdb6           14187       15492    10490413+  fd  Linux raid
autodetect
/dev/sdb7           15493       16798    10490413+  83  Linux
/dev/sdb8           16799       17452     5253223+  83  Linux
/dev/sdb9           17453       18106     5253223+  83  Linux
/dev/sdb10          18107       22023    31463271   83  Linux

Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x05f505f4

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *           1       12748   102398278+   7  HPFS/NTFS
/dev/sdc2           12749       12814      530145   83  Linux
/dev/sdc3           12815       12880      530145   82  Linux swap /
Solaris
/dev/sdc4           12881       60801   384925432+   5  Extended
/dev/sdc5           12881       14186    10490413+  fd  Linux raid
autodetect
/dev/sdc6           14187       15492    10490413+  fd  Linux raid
autodetect
/dev/sdc7           15493       16798    10490413+  83  Linux
/dev/sdc8           16799       17452     5253223+  83  Linux
/dev/sdc9           17453       18106     5253223+  83  Linux
/dev/sdc10          18107       22023    31463271   83  Linux

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xea26ea26

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       12748   102398278+   7  HPFS/NTFS
/dev/sda2           12749       12814      530145   83  Linux
/dev/sda3           12815       12880      530145   82  Linux swap /
Solaris
/dev/sda4           12881       60801   384925432+   5  Extended
/dev/sda5           12881       14186    10490413+  fd  Linux raid
autodetect
/dev/sda6           14187       15492    10490413+  fd  Linux raid
autodetect
/dev/sda7           15493       16798    10490413+  83  Linux
/dev/sda8           16799       17452     5253223+  83  Linux
/dev/sda9           17453       18106     5253223+  83  Linux
/dev/sda10          18107       22023    31463271   83  Linux