Re: Growing after replacing with larger discs

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Forgot to send to the list...

On Sat, Mar 13, 2010 at 13:42, Beolach <beolach@xxxxxxxxx> wrote:
> On Fri, Mar 12, 2010 at 10:39, John Robinson
> <john.robinson@xxxxxxxxxxxxxxxx> wrote:
>> Before I have to go to a customer's premises and try it, I wanted to ask if
>> anyone had already done anything like this: I have a CentOS 5 system with
>> 0.90 metadata and type fd partitions with RAID-5 over 3 discs. I want to
>> grow it by replacing the drives. If I dd the small partitions onto larger
>> ones on the new discs, then reboot, will the system recognise the RAID-5 -
>> which now has its metadata somewhere in the middle of the paritions not at
>> the end - so that I can then --grow?
>>
>
> I have no idea if this would actually work, but maybe try partitioning
> the new, larger drives so the partitions are identical in size to the
> old discs, copying the old discs to the new partitions, starting the
> array with the new partitions, resizing the new partitions, and then
> running --grow.  If mdadm can re-check the size of the member devices
> of a running array at --grow time, this might work, but if it only
> checks member device sizes at creation or assemble time, then it
> probably won't.
>
>
> Good luck,
> Conway S. Smith
>
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