[CentOS] Anaconda doesn't support raid10

Toby Bluhm tkb at midwestinstruments.com
Mon May 7 20:32:21 UTC 2007


Ruslan Sivak wrote:
> Ross S. W. Walker wrote:
>>> -----Original Message-----
>>> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] 
>>> On Behalf Of Ruslan Sivak
>>> Sent: Monday, May 07, 2007 12:53 PM
>>> To: CentOS mailing list
>>> Subject: [CentOS] 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?


-- 
Toby Bluhm
Midwest Instruments Inc.
30825 Aurora Road Suite 100
Solon Ohio 44139
440-424-2250





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