Re: Problems installing BRUB with RAID5
Damon L. Chesser wrote:
> Scott Lair wrote:
> >Damon L. Chesser wrote:
> >
> >>Damon L. Chesser wrote:
> >>
> >>>Chris Willard wrote:
> >>>
> >>>>Hi All,
> >>>>
> >>>>I have a pc with 3x40GB IDE drives.
> >>>>
> >>>>I have 2 RAID 5 devices setup-
> >>>>
> >>>>/dev/md0 = 3 x 38GB as /
> >>>>/dev/md1 = 3 x 2GB as SWAP
> >>>>
> >>>>Debian base installs OK but when I get to the Grub installation I get a
> >>>>"Fatal Error" message.
> >>>>
> >>>>I am telling Grub to install on /dev/md0 but it won't install.
> >>>>
> >>>>Any tips would be appreciated.
> >>>>
> >>>>Regards,
> >>>>
> >>>>Chris
> >>>>
> >>>>
> >>>>
> >>>>
> >>>Chris,
> >>>
> >>>AFAIK, grub can only be set up on a raid0 or a raid1 device. So far,
> >>>I can not document this, but I seem to recall that fact. As others
> >>>said, you need to install grub on REAL devices. You can see
> >>>www.damtek.com for a (I hope rather thorough) walk through on how to
> >>>set up grub on a raid.
> >>>
> >>>
> >>Just adding more info on the on the raid0 and raid1 and grub. I have
> >>just remembered where I got that info from. RHEL-4 will only let you
> >>select raid0 or raid1 for the /boot partition, or for / if /boot is not
> >>a separate partition during install. I suspect this is a RHEL issue and
> >>not a grub issue, but truly, I don't know. I just did not want to be
> >>putting out bad info, so I thought I would expand on why I thought only
> >>raid0 and raid1 would work for grub.
> >>
> >>Since I can't find any documentation on the limits of raid and grub, I
> >>suspect you can run raid5. Anybody willing to confirm this for me?
> >>
> >>--
> >>Damon L. Chesser
> >>damon@damtek.com
> >>damon@okfairtax.org
> >>
> >
> >
> >My experience with raid5 was that grub cannot be installed on it.
> >I had to setup grub on each drive in my mirror separatel. I ended up
> >setting up
> >a small /boot then setting up grub on each disk in the mirror. If I recall
> >correctly, grub was installed on /dev/hda only, so I ran setup on /dev/hdb
> >etc...
> >
> >just from my own experience, I'm no expert.
> >
> >scott lair
> >
> >
> >
> Scott,
>
> Thanks for the reply, I obviously am no expert either. I know you have
> to manually set up grub on each HD on a raid0 and a raid1. My question
> is, is the limit of only raid0 or raid1 for /boot (assuming separate
> partitions) a function of the RHEL install process, or is it a limit in
> grub it's self?
>
> I know this is not a RHEL user list, but this is a grub question, since
> I can't seem to locate any documentation on grub and raid limits and I
> gave advise to the OP, thought I would have it confirmed or not.
>
> --
> Damon L. Chesser
> damon@damtek.com
> damon@okfairtax.org
>From what I have seen grub is the limiting factor. It does not
"understand" raid5 disks.
scott lair
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