Re: RFC - new raid superblock layout for md driver

[Steven Dake <sdake@mvista.com>]

Doug,

Yup this would be ideal and I think this is what EVMS tries to do, 
although I haven't tried it.

The advantage of doing such a thing would also be that MD could be made 
to work with shared LVM VGs for shared storage environments.

now to write the code...

-steve

Doug Ledford wrote:

>On Thu, Nov 21, 2002 at 12:57:42PM -0700, Steven Dake wrote:
>  
>
>>Doug,
>>
>>EVMS integrates all of this stuff together into one cohesive peice of 
>>technology.
>>
>>But I agree, LVM should be modified to support RAID 1 and RAID 5, or MD 
>>should be modified to support volume management.  Since RAID 1 and RAID 
>>5 are easier to implement, LVM is probably the best place to put all 
>>this stuff.
>>    
>>
>
>Yep.  I tend to agree there.  A little work to make device mapping modular
>in LVM, and a little work to make the md modules plug into LVM, and you
>could be done.  All that would be left then is adding the right stuff into
>the user space tools.  Basically, what irks me about the current situation
>is that right now in the Red Hat installer, if I want LVM features I have
>to create one type of object with a disk, and if I want reasonable
>software RAID I have to create another type of object with partitions.  
>That shouldn't be the case, I should just create an LVM logical volume,
>assign physical disks to it, and then additionally assign the redundancy
>or performance layout I want (IMNSHO) :-)
>
>
>  
>