RAID and /boot partitions

[redhatdude at bellsouth.net]

-------------- Original message ----------------------
From: redhatdude at bellsouth.net
>
> 
> 
> -------------- Original message ----------------------
> From: Bill Davidsen <davidsen at tmr.com>
> >
> > redhatdude at bellsouth.net wrote:
> > > Hi,
> > > When creating a RAID 1 in F9.
> > > Does it make sense to make the /boot partition on both discs a RAID too?
> > I have /boot and / as RAID 1 (dm-0 and dm-1). If I disconnect one of the 
> > drives, the computer freezes. Isn't the RAID supposed to keep it running?
> > > I'm really new to this, so any help is appreciated.
> > > 
> > Are you sure /boot is on a raid partition, and not on a dm pseudo 
> > device? If you created a partition on your drives, made a raid-1 of the 
> > two partitions (100-200MB is good), and then did whatever with the rest 
> > of your disk, you should be fine.
> > 
> > If you made one huge raid array and used dm to break it up, you are not 
> > fine. Do "cat /proc/mdstat" and see that there is a small raid-1 for 
> > boot, and "df" to check that /dev/mdX is mounted on /boot. If that's the 
> > case you should be good, otherwise you probably don't boot off one drive.
> > 
> > NOTE: your BIOS may not boot off the 2nd drive if the 1st drive is 
> > present and has data errors, should if the 1st drive is dead. Some BIOS 
> > do, some don't.
> > 
> > -- 
> > Bill Davidsen <davidsen at tmr.com>
> >    "We have more to fear from the bungling of the incompetent than from
> > the machinations of the wicked."  - from Slashdot
> 
> This is the output of df.
> 
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/md1             470535632   3951984 442681744   1% /
> /dev/md0                 99099     12499     81484  14% /boot
> tmpfs                  2032168        48   2032120   1% /dev/shm
> 
> And this is the output of cat /proc/mdstat 
> Personalities : [raid1] [raid6] [raid5] [raid4] 
> md0 : active raid1 sdb1[1] sda1[0]
>       102336 blocks [2/2] [UU]
>       
> md1 : active raid1 sda3[0] sdb3[1]
>       478038080 blocks [2/2] [UU]
>       
> unused devices: <none>
> 
> 
> I have two drives with /boot and /
> If I unplug the first one, the system remains up and running. If I however 
> unplug the second one, the system becomes unstable, X crashes, and eventually 
> the system becomes irresponsive.
> Why does this happen with one disk only?
> Thanks,
> EJ
> 
> 
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To answer my own question.
The problem is that the swap partition is only on one disk and it's not RAIDed. So when I unplug the drive with the swap partition, the system goes down.
The next step would be to create a RAID for swap and make the system use it.
EJ