Synology can auto expand storage volume by adding disks to redundant
RAID types such as RAID1,5 or 6. In your case, adding disk and asking
the filer to integrate it will add it to RAID1 configuration - you will
gain redundancy, not capacity. If you add another 2 disks and ask the
filer to integrate them - it will create RAID5 - giving you redundancy
and expand the storage capacity to 2x - RAID 5 uses one disk for
redundancy/parity, so the volume size is always sum(n-1), n-being
number of disks.
Raid 0 is striping - it combines the disk space from 2 or more disks to
larger volume - obvious disadvantage is you loose all data on any disk
failure and at RAID0 creation.
If you want the combined disk space from 2 disks and do not care about
redundancy - just add the disk to your Synology filer, add it to disk
group, create JBOD volume and you are done or you can create new volume
and export it separately. In the event one of your disks failing, the
data on the second one are normally accessible either in the filer or
as ext4 filesystem.
I would think that using your Synology filer is better, safer and more
reliable way to go than some exotic USB enclosure. Feel free to bring
your filer + disk to PLUG clinic to get help.
Hope it helps, Tomas
On Mon, 2017-04-03 at 11:53 -0700, Robert Citek wrote:
> Most likely, yes. The RAID (of any level) needs to be initialized,
> and that process will effectively wipe data on the attached physical
> devices.
>
> That said, there are some interesting RAID-like technologies that
> automatically expand across new devices, e.g. Drobo, acting like a
> hybrid of RAID and LVM. I don't know if Synology NAS employs that or
> similar technology.
>
> Regards,
> - Robert
>
> On Mon, Apr 3, 2017 at 10:44 AM, John Jason Jordan <joh...@gmx.com>
> wrote:
> > If I start with one 8TB drive in my Synology NAS, and later add
> > another and set them up as Raid 0, does the striping to Raid 0 mean
> > that the data on the existing drive gets wiped out?
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