LVM problem <SOLVED>

[Robin Laing]

Les Mikesell wrote:
> On Fri, 2005-10-07 at 10:54, Scot L. Harris wrote:
> 
>>>I know the difference between the two but I am looking at LVM groups 
>>>made from RAID1 (mdx) drives.  I am assuming and hoping that the RAID 
>>>will protect the LVM as I am not losing the drive but only a copy.
>>
>>That is my understanding.  The raid portion will protect you from a
>>drive failure.  The trick is to make sure you are alerted when there is
>>a problem and get the drive replaced.  
>>
>>The only question I have in such a setup is how do you grow an LVM
>>volume if the space was not already part of the raid group previously
>>setup?  Do the raid tools under linux allow you to grow a raid group by
>>adding a drive?
> 
> 
> I think what you do is build another RAID1 device out of two more
> disks, then add the raid device to the LVM and resize the filesystem
> to use the space.   Does anyone have a real step-by-step to start
> an LVM on top of software raid, then expand it later?
> 

That is it.  I am going to be trying it.  I think I will do it sooner 
than later and do a full backup before I do.

I would assume that it would be the same as just adding a single 
partition as the LVM only sees the /dev/dmx, not the individual drives.
-- 
Robin Laing