Re: [PATCH 00/18] Assorted md patches headed for 2.6.30

["Keld Jørn Simonsen" <keld@dkuug.dk>]

On Thu, Feb 12, 2009 at 09:13:17AM +0000, Steve Fairbairn wrote:
> Keld Jørn Simonsen wrote:
> >
> >I would rather have functionality to convert raid10 to raid5.
> >raid1 should be depreciated, as raid10,n2 for all purposes is the same
> >but better implementation and performance, and raid10,f2 and raid10,o2
> >are even better.  Nobody should use raid1 anymore.
> >
> Complete ignorance of raid10 here, but is raid10,<anything> bootable, 
> like raid1 is?  I use raid1 on my root and boot partitions.

AFAIK, raid10,n2 in default mode (superblock etc) is bootable, as it
looks like two copies of a normal FS. I think this was even reported 
on this list at some time. 

You are not the only one that does not know much about raid10. I think
most Linux administrators don't.  And other system adminstrators most
likely don't either.

Maybe we should rename raid10 to raid1?

Raid10 should just be an enhanced raid1. And I understand from Neil that
raid10,o2 is mostly done because it is a standard raid1 layout. So it is
strange that it is not available with raid1 in Linux. And I also think
that the raid10,f2 layout is available from some HW raid controllers, as
their implementation of raid1. So all what is in raid10 is other places
considered raid1 stuff.

Or we could merge the two drivers. 

I think we will never get people in general to know about raid10 as well
as they know about raid1, not even by far. 

Best regards
keld
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