Re: Linear RAID hot grow

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Mon, 20 Aug 2007, Dat Chu wrote:

> I am trying to find the mdadm version that support Linear RAID hot
> grow. Does anyone have a link to point me to? I am currently running
> 2.6.2.
>
> With warm regards,
> Dat Chu
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Not sure, it seems like it would be supported by now?

But according to the docs for 2.6.2:

        Grow   Grow  (or shrink) an array, or otherwise reshape it in some way.
               Currently supported growth options including changing the active
               size of component devices in RAID level 1/4/5/6 and changing the
               number of active devices in RAID1/5/6.

--

http://neil.brown.name/blog/SoftRaid

--grow option for "linear" md arrays

I've just been working on an enhancement for Linux "MD" linear arrays 
which allows them to be enlanged.

More specifically, a new device (typcially disk drive) can be added to the 
end of an active linear array now. The size increases accordingly.

You can find patches for mdadm and 2.6.7-rc3-mm1.

It is still a work in progress, as it isn't documented, some of the code 
doesn't report errors very nicely, and I realised that there is some work 
needed in md.c with respect to handling new superblocks.

I really should do the new-superblock code in mdadm and get it all tidied 
up.