Hi,
A couple of years ago I converted my system to run off a software raid 1
rather than from a single disk. On the dual 250GB disks I have set up two
partitions:
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Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 1246 10008463+ fd Linux raid
autodetect
/dev/sdb2 1247 30401 234187537+ fd Linux raid
autodetect
-----
sdb1/sdc1 is a raid 1 called /dev/md0, sdb2/sdc2 is a partitionable raid 1
called /dev/md_d0, partitioned and used for usr, var & home.
Partitions are set up as follows:
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Filesystem 1K-blocks Used Available Use% Mounted on
/dev/md0 9851232 236736 9114080 3% /
udev 10240 76 10164 1% /dev
/dev/md_d0p1 29529044 8936164 19092880 32% /usr
/dev/md_d0p2 19685916 10876740 7809176 59% /var
/dev/md_d0p3 9842852 3453940 5888912 37% /home
none 517192 0 517192 0% /dev/shm
-----
At the time when I set this up I found that the only way for me to get it
to boot properly was to have the following kernel options in my grub.conf:
raid=noautodetect md=0,/dev/sdb1,/dev/sdc1 md=d0,/dev/sdb2,/dev/sdc2
As it was some time ago I don't recall exactly why that had to be there,
but it doesn't work without having those kernel options. I've just started
thinking of adding more software raid disks to my system and figured it
would be nice if autodetect would work for me so I would prefer to get rid
of those options. If I remove the "raid=noautodetect" bit, or all of it,
then the system fails to boot properly. From what I can see on the console
it appears to find the md_d0 raid and partitions just fine, but not the
/dev/md0 raid which obviously causes the boot to fail. So my question now
is, why is autodetect not working properly and what can I do to fix it?
I'm sure there is more information I should have provided here, please ask
if anything is missing. Here is my /proc/mdstat and the full entry from
grub.conf:
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# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4]
md_d0 : active raid1 sdc2[1] sdb2[0]
234187456 blocks [2/2] [UU]
md0 : active raid1 sdc1[1] sdb1[0]
10008384 blocks [2/2] [UU]
unused devices: <none>
-----
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title=Gentoo Linux 2.6.29-gentoo-r5
kernel (hd0,0)/boot/kernel-2.6.29-gentoo-r5 root=/dev/md0
raid=noautodetect md=0,/dev/sdb1,/dev/sdc1 md=d0,/dev/sdb2,/dev/sdc2
savedefault fallback
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Best regards, and thanks in advance for any answers.
/Fredrik Pettersson
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