CentOS docs - Apr 2009 - I'd like to contribute two wiki articles

Hi,

I've written two small howtos, and would like to contribute them to the
CentOS
Wiki. The first one is "How to install CentOS 5 on software partitionable
mdadm
RAID1", and the second one "How to repair a software mdadm RAID5 with
two or
more failed disks (if you know that information is still on the disks and
readable)". I think that the first one should be somewhere like
wiki.centos.org/HowTos/Install_On_Partitionable_RAID1 with a reference from
wiki.centos.org/HowTos and the second one should be
wiki.centos.org/TipsAndTricks/Reparing_RAID5_With_Many_Failures with a reference
from wiki.centos.org/TipsAndTricks

My account name on the wiki.centos.org is LevShamardin, and the untranslated
russian versions of these articles are available in my blog at
http://abbot2.blogspot.com/2009/04/centos-53-partitionable-raid1.html and
http://abbot2.blogspot.com/2009/04/mdadm-raid5.html

With best regards,
Lev.

On Wed, 2009-04-29 at 22:41 +0400, Lev Shamardin wrote:
> Hi,
> 
> I've written two small howtos, and would like to contribute them to the
CentOS
> Wiki. The first one is "How to install CentOS 5 on software
partitionable mdadm
> RAID1", and the second one "How to repair a software mdadm RAID5
with two or
> more failed disks (if you know that information is still on the disks and
> readable)". I think that the first one should be somewhere like
> wiki.centos.org/HowTos/Install_On_Partitionable_RAID1 with a reference from
> wiki.centos.org/HowTos and the second one should be
> wiki.centos.org/TipsAndTricks/Reparing_RAID5_With_Many_Failures with a
reference
> from wiki.centos.org/TipsAndTricks
> 
> My account name on the wiki.centos.org is LevShamardin, and the
untranslated
> russian versions of these articles are available in my blog at
> http://abbot2.blogspot.com/2009/04/centos-53-partitionable-raid1.html and
> http://abbot2.blogspot.com/2009/04/mdadm-raid5.html
> 
> With best regards,
> Lev.
---
What's that chance of reading them in English?

JohnStanley

Lev Shamardin wrote:
> Hi,
>
> I've written two small howtos, and would like to contribute them to
> the CentOS Wiki. The first one is "How to install CentOS 5 on software
> partitionable mdadm RAID1",
Is that different from
<http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5>?
> and the second one "How to repair a software mdadm RAID5 with two or
> more failed disks (if you know that information is still on the disks and
> readable)".
That one sounds interesting.

Ralph
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On Wed, 2009-04-29 at 20:55 +0200, Ralph Angenendt
wrote:
> Lev Shamardin wrote:
> > Hi,
> >
> > I've written two small howtos, and would like to contribute them
to
> > the CentOS Wiki. The first one is "How to install CentOS 5 on
software
> > partitionable mdadm RAID1",
> 
> Is that different from
<http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5>?
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&u=http
%3A%2F%2Fabbot2.blogspot.com%2F2009%2F04%
2Fcentos-53-partitionable-raid1.html&sl=ru&tl=en&history_state0
I read it but can't wrap my head around it right now. Essentially it is
the same but done after the OS install.

JohnStanley
> > and the second one "How to repair a software mdadm RAID5 with two
or
> > more failed disks (if you know that information is still on the disks
and
> > readable)".
> 
> That one sounds interesting.
> 
> Ralph

On 04/29/2009 10:55 PM, Ralph Angenendt wrote:
> Lev Shamardin wrote:
>> Hi,
>>
>> I've written two small howtos, and would like to contribute them to
>> the CentOS Wiki. The first one is "How to install CentOS 5 on
software
>> partitionable mdadm RAID1",
> 
> Is that different from
<http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5>?
There is one really HUGE difference. Using that guide you get a system with N
regular raids (where N is the number of the partitions you create). This means
that to rebuild a raid after failure you need to recreate N partitions on a
spare disk, and rebuild N raid volumes.

My guide describes how to install on a partitionable mdadm raid (with devices
/dev/md_d0pX). To repair such system you need to repair only one raid volume,
and you do not need to mess with partition table, etc.

Actually quick search on google some days ago showed that there are apparently
no guides about how to install any of the linux distributions on a partitionable
raid :)

With best regards,
Lev.