Re: Resize raid? RAID Reconfig Tool?

Jan Johansson a écrit :
We use mdadm to administer our software raid. For (certain) hardware raid there other tools available. Just "apt-cache search raid"...

Wait... does mdadm have that built in?



Let's rephrase that.

Lets say I just did

cookiemonster:/mnt/hde1# mdadm --create /dev/md0 --level=5
--raid-devices=2 /dev/hd[cd]1 --auto
mdadm: array /dev/md0 started.

Which gives me a RAID5 on 2x200GB (That right now really is a RAID1)

Raid5 on n-1 disks is more like raid0....


And I later on would like to add _another_ 200GB disk to that array and
turn it into a 400GB RAID5, can mdadm do that?

What you can basically do is build a degraded array (using missing)
mdadm -Cv /dev/md0 -l1 -n3 /dev/hdc1 /dev/hdd1 missing

It will be like having raid0 (in terms of security) but will let you move your existing data onto it.

Laurent


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