Hi everyone:
I think I got a better understanding now.
What I want to do is to make a raid1 device using a
existing partition(of which the data I need to keep)
and 2nd partition from 2nd hard disk.
RedHat6.1 is installed and there are only two IDE
hard disks(same capacity).
After all the e-mails back and forth, I believe there
are two ways:(although they are pretty similar)
Assmuming /dev/hda7 contains the needed data and
/dev/hdc8 is 2nd partition. We want to make a raid1
device /dev/md0 on top of /dev/hda8 and /dev/hdc8.
a) ;;specify /dev/hdc8 as failed-disk.
mkraid /dev/md0.
(the message will say /dev/hdc8 is a failed disk)
;; /proc/mdstat should indicate raid1 is running
using only /dev/hda8.
raidhotadd /dev/md0 /dev/hdc8
(this will sync hdc8 to hda8, thus the /dev/md0
will have the data we want to keep)
;;modify raidtab to specify /dev/hdc8 as raid-disk.
(So next reboot will have /dev/md0 running
normally)
b) ;;specify /dev/hda8 as failed-disk.
mkraid /dev/md0.
(the message will say /dev/hdc8 is a failed disk)
;;/proc/mdstat should indicate raid is running
using only /dev/hdc8.
;;copy contenet of /dev/hda8 to /dev/md0
raidhotadd /dev/md0 /dev/hda8
(hda8 will be sync'ed to hdc8. That's OK, because
both have the same contenet now)
;;modify raidtab to specify /dev/hda8 as raid-disk.
(So next reboot will have /dev/md0 running
normally)
Apparently method a) is a little easier.
Hope this will help others who are trying to do the
same thing.
Thanks.
Jason
>
> If you don't want to lose the data on /dev/hda7,
> then you should make it
> the failed-disk to start off with. Also, put your
> /dev/hdc7 entry in
> first:
>
>
> device /dev/hdc7
> raid-disk 0
>
> device /dev/hda7
> failed-disk 1
>
>
> That should do it.
>
> Chris
> --
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