Re: RAID-1 to RAID-5 online migration?
Ralph Paßgang wrote:
>Am Donnerstag 02 September 2004 15:18 schrieb Mark Janssen:
>
>
>>On Thu, 2004-09-02 at 13:43, Gavin Hamill wrote:
>>
>>
>>>Hello - just a quickie :)
>>>
>>>If I construct a RAID1 with two 200GB disks, will I be able to add a
>>>third disk and convert the whole set to a 400GB RAID5 later on by
>>>logically removing the second disk from the RAID1 set?
>>>
>>>
>>Nope... migrating to a different raid configuration wipes your disks
>>So you'll have to backup, migrate and restore.
>>
>>
>
>Yes, but you can make something like this:
>
>remove one drive from the raid-1. You get an dregraded, but normal working
>raid1 array.
>
>create a new raid5 for three disks, but you add only two disks to the raid5.
>So you are building a dirty raid array, but this should works. (never tested
>it myself with a raid5, only with a raid1)
>
>Now you can copy the data from your degraded raid1 to your new raid5.
>
>After that is done you can delete the old raid1 completly and add the now free
>disk to the raid5...
>
>But be carefull, if you make something wrong you can loose all data, so making
>a backup is of course the better and the secure way.
>
>--Ralph
>
>
>
>
I've actually done this exact thing before and it worked flawlessly.
Dave
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