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Old 04-23-2007, 11:25 AM   #1
Registered: Apr 2006
Location: Athens, Greece
Distribution: slackware, debian, ubuntu
Posts: 647

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how to disassemble / destroy a raid

hello everyone!
how can i disassemble a raid 5 partition?
basically i have 3 x320GB hd's at the moment in raid5.. thats sdb1, sdc1 and sdd1..
i am just in my initial steps with raid.. and i managed to get a hold of a 4th identical drive..
so im reading that i could add it with mdadm --grow..
but since i haven't written anything on the drives yet.. i could just destroy this raid.. and make a completely fresh one..

an additional reason is that having not done that before in the current raid i did not use the --force option thus mdadm decided to create a raid 5 (out of my 3 drives) one of which is labeled 'missing' and used as a spare instead...
that results in having only 2 active drives in raid 5 which in turn means i only get 1/3 of the space i have. ie df returns to me 320GB for /dev/md0 node instead of 640GB that it should (2/3 x total size).

so how can i go about destroying the raid table or whatever else so that i can start the raid again from scratch?
thank you for your help
Old 04-23-2007, 12:02 PM   #2
Registered: Jul 2003
Location: Miami, Florida, USA
Distribution: Debian
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Reformat each drive with fdisk.
Old 05-11-2007, 10:29 AM   #3
Registered: Mar 2003
Distribution: Slack 9.0
Posts: 123

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before you go ahead, i'd write some data to the disk, and try to add extra drive the the grow command and see if it works. then experiment with it a little bit before you actually put it to work. might save you a lot of troubles in the future. just a suggestion.


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