hi philippe
if you want your system to boot...no many how badly damaged
your system might get... ( within reason )...you should
keep / as SMALL as possible so that yu can always boot
into single user mode to fix things
To test that raid1 setup properly..
-----------------------------------
- power down... pull the ide cable to either of the disk
- boot it up.... if it works...good
- power down... reconnect the simulated bad disk...
- boot it up... and let it resync again....
-
- cat /proc/mdstat should tell you its status???
than simulate the OTHER failed disk
keeping /boot separate is not very useful that you cn boot
a kernel since you dont have a root filesystem yet..
have fun
alvin
http://www.Linux-Consulting.com/Raid
the following worked for me... unplugged drives and everything still
booted... ( be careful, that any data written while in degraded mode
due to the fail disk is not yet mirrored... ie it...getit out of
degraded mode asap...
my test environment/partitions
------------------------------
/ 64Mb - just need to have 64Mb of good disk to work your magic
/tmp 128Mb
/var 256mb
/usr 2048Gb
swap 2xMemory ( say 512M max )
/opt reset of disk for user space
/etc/fstab
----------
/dev/md0 /
/dev/md1 /tmp
/dev/md2 /var
/dev/md3 /usr
/dev/md4 /home
/etc/lilo.conf
---------------
....
boot=/dev/md0
....
image=/boot/vmlinuz-2.2.19-Raid
label=linux-2.2.19-Raid
root=/dev/md0
...
/etc/raidtab ( with 2 disks ) - properly defined in the real file
------------
/dev/md0 /dev/hda1 + /dev/hdc1 /
/dev/md1 /dev/hda2 + /dev/hdc2 /tmp
/dev/md2 /dev/hda3 + /dev/hdc3 /var
/dev/md3 /dev/hda5 + /dev/hdc5 /usr
/dev/md4 /dev/hda7 + /dev/hdc7 /home
- no point to making swapspace raid1 ???
... have fun ...
On Mon, 28 May 2001, Philippe Trolliet wrote:
> hello,
> i want lilo to boot from the md devices even if one hd fails. can anybody
> help me?
> here my configuration:
>
> df -h shows:
> Filesystem Size Used Avail Use% Mounted on
> /dev/md0 28G 3.5G 23G 14% /
> /dev/md1 99M 5.3M 88M 6% /boot
> ----------------------------------------------------------------------------
> -------
> my raidtab:
>
> #MD0
> raiddev /dev/md0
> raid-level 1
> nr-raid-disks 2
> chunk-size 32
> nr-spare-disks 0
> persistent-superblock 1
> device /dev/hdc3
> raid-disk 0
> device /dev/hda3
> raid-disk 1
>
> #MD1
> raiddev /dev/md1
> raid-level 1
> nr-raid-disks 2
> chunk-size 32
> nr-spare-disks 0
> persistent-superblock 1
> device /dev/hdc1
> raid-disk 0
> device /dev/hda1
> raid-disk 1
> ----------------------------------------------------------------------------
> -------
> my fstab:
>
> /dev/hda2 swap swap defaults 0 2
> /dev/hdc2 swap swap defaults 0 2
> /dev/md0 / ext2 defaults 1 1
> /dev/md1 /boot ext2 defaults 1 1
>
> /dev/hdb /cdrom auto
> ro,noauto,user,exec 0 0
>
> /dev/fd0 /floppy auto noauto,user 0 0
>
> proc /proc proc defaults 0 0
> # End of YaST-generated fstab lines
> ----------------------------------------------------------------------------
> -------
> /proc/mdstat:
>
> Personalities : [linear] [raid0] [raid1] [raid5]
> read_ahead 1024 sectors
> md1 : active raid1 hda1[1] hdc1[0] 104320 blocks [2/2] [UU]
> md0 : active raid1 hda3[1] hdc3[0] 29808512 blocks [2/2] [UU]
> unused devices: <none>
>
> thanks a lot
> best regards
> ph. trolliet
>
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