[CentOS] Linux Software RAID 1 - Unequal Sized Hard Disks

Bowie Bailey Bowie_Bailey at BUC.com
Thu Oct 18 14:16:56 EDT 2012


On 10/18/2012 12:58 PM, Manish Kathuria wrote:
> On Thu, Oct 18, 2012 at 9:25 PM, Bowie Bailey <Bowie_Bailey at buc.com> wrote:
>> On 10/18/2012 11:29 AM, Manish Kathuria wrote:
>>> Has anyone created or rebuilt a Linux Software RAID having mirrored
>>> partitions on unequal sized hard disks ? There is  a CentOS 5 server
>>> having two 400 GB hard disks with five mirrored partitions (software
>>> RAID 1) and one of the hard disks is dying. Since new 400 GB HDDs are
>>> not available here, we are exploring the possibility of replacing the
>>> faulty hard disk with one of a higher capacity (500 GB or more). And
>>> once it is fully replicated, we plan to replace the other 400 GB HDD
>>> also with another hard disk of the same higher capacity.
>>>
>>> Just want to know if anyone has done something similar and what are
>>> the chances of success (or data loss) ?
>> I've done this with a 3-drive software raid 1.  It originally had 750GB
>> drives which I replaced with 1TB drives.
>>
>> Swapped them out one by one configuring them with the exact same
>> partition structure as the others and allowing each one to resync before
>> continuing.  Once they were all in, I resized the filesystem (ext3) to
>> take advantage of the extra space.
>>
>> --
>> Bowie
> That sounds perfect. Did you create the new partitions manually using
> fdisk / sfdisk ? I guess that can take care of the logical partitions.

Yes.  I used sfdisk to copy the partition table.

-- 
Bowie


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