Another new users' guide to installing Linux software RAID 10

Another new users' guide to installing Linux software RAID 10

[Bruce Miller]

Another article has appeared on a mainstream Linux web site which aims to smooth the installation of Linux RAID 10 for beginners:
http://howtoforge.com/install-ubuntu-with-software-raid-10

As someone who merely lurks on this list and almost never posts, I do not dare to assess the accuracy or soundness of this article. But Howtoforge has a certain popularity among users who are not full-time IT professionals.

It might be useful if one of the experts on this site looked at the article; if you find it worthwhile, perhaps a link could be added to wiki.linux-raid.osdl.org.


 --
Bruce Miller
Ottawa ON, Canada
bruce@brmiller.ca
(613) 745-1151
This message is from a webmail login and not from my regular mail system. It does not have my customary digital signature.

Re: Another new users' guide to installing Linux software RAID 10

[John Robinson]

On 19/08/2008 15:25, Bruce Miller wrote:
> Another article has appeared on a mainstream Linux web site which aims to smooth the installation of Linux RAID 10 for beginners:
> http://howtoforge.com/install-ubuntu-with-software-raid-10
> 
> As someone who merely lurks on this list and almost never posts, I do not dare to assess the accuracy or soundness of this article. But Howtoforge has a certain popularity among users who are not full-time IT professionals.
> 
> It might be useful if one of the experts on this site looked at the article; if you find it worthwhile, perhaps a link could be added to wiki.linux-raid.osdl.org.

I don't claim to be an expert, but...

1. "Raid 10 is the fastest RAID level that also has good redundancy 
too". This isn't necessarily true.

2. The configuration suggested will crash if any disc crashes, because 
it has swap on raw disc partitions.

3. The configuration suggested cannot reboot if the first disc crashes 
because /boot is on a raw partition on the first disc only.

If I've got this all wrong, please let me know...

Cheers,

John.

Re: Another new users' guide to installing Linux software RAID 10

[Keld Jørn Simonsen]

On Tue, Aug 19, 2008 at 06:06:02PM +0100, John Robinson wrote:
> On 19/08/2008 15:25, Bruce Miller wrote:
> >Another article has appeared on a mainstream Linux web site which aims to 
> >smooth the installation of Linux RAID 10 for beginners:
> >http://howtoforge.com/install-ubuntu-with-software-raid-10
> >
> >As someone who merely lurks on this list and almost never posts, I do not 
> >dare to assess the accuracy or soundness of this article. But Howtoforge 
> >has a certain popularity among users who are not full-time IT 
> >professionals.
> >
> >It might be useful if one of the experts on this site looked at the 
> >article; if you find it worthwhile, perhaps a link could be added to 
> >wiki.linux-raid.osdl.org.
> 
> I don't claim to be an expert, but...
> 
> 1. "Raid 10 is the fastest RAID level that also has good redundancy 
> too". This isn't necessarily true.
> 
> 2. The configuration suggested will crash if any disc crashes, because 
> it has swap on raw disc partitions.
> 
> 3. The configuration suggested cannot reboot if the first disc crashes 
> because /boot is on a raw partition on the first disc only.
> 
> If I've got this all wrong, please let me know...

I think you are right.

Also it is claimed that you need 4 disk drives to do it, while you can
run raid10 with just 2 drives. 

And he does not mention our wiki nor raid10,f2.

Best regards
keld