Re: Resize raid? RAID Reconfig Tool?

[Laurent CARON <lcaron@unix-scripts.info>]

Jan Johansson a écrit :
> > Raid5 on n-1 disks is more like raid0....
>
>
> Are you sure there? It seem to have come up as one 200GB device?

because you forgot the missing drive

> cookiemonster:~# cat /proc/mdstat
> Personalities : [raid5]
> md0 : active raid5 hdd1[1] hdc1[0]
>       195358336 blocks level 5, 64k chunk, algorithm 2 [2/2] [UU]
>
> unused devices: <none>
> cookiemonster:~#
>
>
> > What you can basically do is build a degraded array (using missing)
> > mdadm -Cv /dev/md0 -l1 -n3 /dev/hdc1 /dev/hdd1 missing
>
>
>
> Wouldn't I want -l5?

my mistake, you're right

> > It will be like having raid0 (in terms of security) but will let you 
> > move your existing data onto it.
>
>
> ...which is what I want, cause the last 200GB is the one with the data
> on.


Basically.

Build your new degraded array.

Migrate data to it.

Rebuild your array

You should be done