Converting a (single-disk) RAID-0 back to a (two-disk) RAID-1

[John Buttery]

* On Monday 16 April 2007 08:10, "Zembower, Kevin" <kzembowe at jhuccp.org> 
wrote:
>John, The reason I knew about this was that the Dell Support Engineer
>walked me through this procedure when I had a drive fail in a 4-drive
>RAID-5 array. When I replaced the drive physically, I probably made a
>mistake and converted the whole array to a 3-drive RAID-0 with one
> drive not participating in any way. The 'omconfig' command converted
> my drives back into a 4-drive RAID-5 while it was still in use with
> no noticeable effect by my users (however, this host has very low
> load to begin with). The full conversion took about five hours for my
> 145MB 10K drives. This is a Linux system running RHEL4.

  Sounds like you were in the same situation I'm in, and looked for (and 
found) the same solution.  You were going back to RAID-5 and I'm trying 
to go back to RAID-1, but I don't think that'll make a difference.

  I'm still trying to find the actual download location for this stuff; 
I've found a bunch of documentation on it, and some stuff about a 
web-based tool...no sign of a set of command-line tools, though.

  This is the command-line I've put together that I'll run with omconfig 
once I can find it and get it installed, just in case anyone wants to 
comment.  The example in the docs specifies the size as '800m'...can I 
use 'g' instead of 'm', or do I need to do something like '132000m'?  
Everything seems to be numbered from zero according to dellmgr, so 
that's what I'm going with here:

omconfig storage vdisk action=reconfigure controller=0 vdisk=0 raid=r1 
size=132g adisk=0:0,0:1

  In 'dellmgr' under "Objects -> Logical Drives" I have one logical 
drive (numbered 0).  Under "Configure -> View/Add Configuration" I 
have "RAID Ch-0" with one disk "ID 0" that's online (that's the 
single-disk RAID-0) and a blank spot in "ID 1" which used to contain 
the new disk before I removed it from the chassis.

-- 
John Buttery <johnb at academicsuperstore.com>
System Administrator