[CentOS] upgrading storage on hardware RAID 10 possible?

Fri Aug 13 08:04:51 UTC 2010
Eero Volotinen <eero.volotinen at iki.fi>

2010/8/13 Rudi Ahlers <Rudi at softdux.com>:
> Hi all,
> Can anyone please tell me, from experience, if it's possible to
> upgrade the hard drives in a RAID 10 system from 250GB HDD's to 500GB
> / 750GB HDD's, while the server is running? The server runs CentOS 5.5
> x64.
> Our hardware vendors simply always say no, so we never actually tried
> doing this, and when a client needed an upgrade like this we had to
> build a new server with the same spec and larger hard drives and then
> migrate the data across, which can sometimes take a few days to
> complete (due to DNS & MAC address caches).
> So, I'm wondering, is it possible (and safe) to upgrade the existing
> drives to larger drives in a running server?
> I know we're done this with Linux's software RAID many times with
> great success. But I don't want to take a risk if it's not possible.
> The amount of effort and upfront costs for a new server makes hardware
> RAID far more expensive than it's reliability, which Linux's software
> RAID offers equally so I'm beginning to think we should just move all
> the servers to software RAID in the future as well.

How about installing new raid 10 on same machine and just migrating
data using rsync ?
after some rsync cycles, just switching to new raid 10 storage.