> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Ruslan Sivak
> Sent: Monday, May 07, 2007 4:00 PM
> To: CentOS mailing list
> Subject: Re: Anaconda doesn't support raid10
>
> Ross S. W. Walker wrote:
> >> -----Original Message-----
> >> From: centos-bounces@xxxxxxxxxx
> >> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Ruslan Sivak
> >> Sent: Monday, May 07, 2007 12:53 PM
> >> To: CentOS mailing list
> >> Subject: Anaconda doesn't support raid10
> >>
> >> So after troubleshooting this for about a week, I was
> finally able to
> >> create a raid 10 device by installing the system, copying the
> >> md modules
> >> onto a floppy, and loading the raid10 module during the install.
> >>
> >> Now the problem is that I can't get it to show up in anaconda. It
> >> detects the other arrays (raid0 and raid1) fine, but the
> raid10 array
> >> won't show up. Looking through the logs (Alt-F3), I see the
> >> following
> >> warning:
> >>
> >> WARNING: raid level RAID10 not supported, skipping md10.
> >>
> >> I'm starting to hate the installer more and more. Why won't
> >> it let me
> >> install on this device, even though it's working perfectly
> from the
> >> shell? Why am I the only one having this problem? Is nobody
> >> out there
> >> using md based raid10?
> >>
> >
> > Most people install the OS on a 2 disk raid1, then create a separate
> > raid10 for data storage.
> >
> > Anaconda was never designed to create RAID5/RAID10 during install.
> >
> > -Ross
> >
> >
>
> Whether or not it was designed to create a Raid5/raid10, it
> allows the
> creating of raid5 and raid6 during install. It doesn't,
> however, allow
> the use of raid10 even if it's created in the shell outside
> of anaconda
> (or if you have an old installation on a raid10).
>
> I've just installed the system as follows
>
> Raid1 for /boot with 2 spares (200mb)
> raid0 for swap (1GB)
> raid6 for / (10GB)
>
> after installing, I was able to create a raid10 device and
> successfully
> mount and automount by using /etc/fstab
>
> Now to test what happens when a drive fails. I pulled out the first
> drive - Box refuses to boot. Going into rescue mode, I was able to
> mount /boot, was not able to mount the swap drive (as to be
> expected, as
> it's a raid0), was also not able to mount the / for some
> reason, which
> is a little surprising.
>
> I was able to mount the raid10 parition just fine.
>
> Maybe I messed up somewhere along the line. I'll try again, but it's
> disheartening to see that a raid6 array would die after one drive
> failure, even if it was somehow my fault.
>
> Also assuming that the raid5 array could be recovered, what
> would I do
> with the swap partition? Would I just recreate it from the
> space in the
> leftover drives and would that be all that I need to boot?
Ok, my bad raid5/6 can be created during install even if OS
can't boot from it.
I guess raid10 is the red headed stepchild of anaconda...
I suggest this:
/dev/md0 raid1, 128MB partition, all 4 drives, for /boot
/dev/md1 raid1, rest of drive space, first 2 drives, for lvm
/dev/md2 raid1, rest of drive space, second 2 drives, for lvm
lvm volgroup CentOS, comprised of /dev/md1 and /dev/md2
logical vol1, root, interleave 2, mount /, 16GB
logical vol2, swap, interleave 2, swapfs, 4GB
This will provide the same performance and fail-over as a raid10.
If you remove the first disk and boot make sure BIOS is set to boot
off of disk2!
-Ross
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