Re: raid question
Hi Alvin,
On Sun, Aug 17, 2003 at 02:25:39PM -0700, Alvin Oga wrote:
> > I was wondering can I set up raid when a partition is mounted?
> > e.g. hda3 is /home and I want to set up raid1 with hdc3.
>
> you can do the "mirroring" ( raid1 ) of hda3 to hdc3
>
> but if you expect to boot off hdc when hda is removed, than it
> probably wont work
I do not want to boot of it.
> and more importantly partition type should be F3 ( linux-raid ) insted of
> ext2 or ext3
I had already made 3 partions (not in use) on both disk EXT3, and made
a raid one system with it. Now I have changed the type to FD (Linux
raid autodetec). I could mount it also when being ext3.
Can't I use ext3 on the raid system?
> > Can I run mkraid when hda3 is in use? I would use the following
> > raidtab:
>
> no ...
>
> you do mkraid /dev/md0 .. you do NOT format /dev/hda or /dev/hdc
> individually .. other than the initial fdisk if you even need to do
> that
Hmm, I think I read in the sofware raid howto that I had to set up all
the partitions. I now think they meant with it that I had to partion
it, but not put a filesystem on it. Right?
Why can't one put a filesystem on it before the raid process?
>
> > raiddev /dev/md0
> > raid-level 1
> > nr-raid-disks 2
> > nr-spare-disks 0
> > chunk-size 4
> > persistent-superblock 0
> > device /dev/hda3
> > raid-disk 0
> > device /dev/hdc3
> > raid-disk 1
>
> looks good
>
> > Also, would I lose data? When happens if I change the above order?
>
> if you type the wrong commands ...
> - yes... you lose data on /dev/hda
>
> order doesnt mean anything in the above
>
> more software raid howto ( converting from /dev/hda to sw-raid )
>
> http://www.1U-Raid5.net/HowTo
Ok thanks! There is more info there than in the software raid howto
on tldp.org
Rudy
--
Rudy Gevaert rudy@zeus.UGent.be
Web page http://www.webworm.org
GNU/Linux user and Savannah hacker http://savannah.gnu.org
Only two things are infinite, the universe and human
stupidity, and I'm not sure about the former.
- Albert Einstein (1879-1955)
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