Toby Bluhm wrote:
Ruslan Sivak wrote:
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?
Russ
Russ,
Nothing here to help you (again - :) just looking down the road a
little. If you do get this thing working the way you want, will you be
able to trust it to stay that way?
Well, it's been my experience, that in linux, unlike windows, it might
take a while to get things the way you want, but once you do, you can
pretty much trust it to stay that way.
So yea, this is what I'm looking to do here. I want to set up a system,
that will live after 1 (or possibly 2) drive failures. I want to know
what I need to do ahead of time, so that I can be confident in my set
up, and know what to do in case disaster strikes.
Russ
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