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Which RAID for home NAS? (a classic UKHA question...!)
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I have a 4-bay QNAP NAS box (TS-420) with 2x 4TB drives configured as a
mirror (RAID 1).
This is now full (more or less).
I thought I would buy two more (but larger, 6TB) drives and add those as a
new mirrored pair. I thought I could simply add them and the 4TBs would
mirror each other, and the 6TBs would mirror each other too. After some
reading this would be configured as two separate RAID groups and joined via
a "storage pool", so not quite as simple, but pretty much what I
thought.
Total nominal storage would be 10 TB.
However, RAID 5 would get me 12TB nominal (4x 4TB - 4TB) with the 6TB
drives identifying as 4TBs within the array. Full 6TB capacity of the new
drives would be realised when I replace the existing 4TB drives.
So it looks like RAID 5 is the way to go?
I like the fault tolerance that RAID provides but recognise that in itself
it's not a complete backup solution.
RAID 6 is higher fault tolerance but lower capacity. RAID 10 (or 01) is
pretty much the "storage pool" solution I was originally
planning.
Is there something obvious that I've missed, or is it RAID 5?
Thanks,
Tim.
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<div dir=3D"ltr">I have a 4-bay QNAP NAS box (TS-420) with
2x 4TB drives co=
nfigured as a mirror (RAID 1).<div>This is now full (more or
less).=C2=A0=
=C2=A0</div><div>I thought I would buy two more (but larger,
6TB) drives an=
d add those as a new mirrored pair. I thought I could simply add them and
t=
he 4TBs would mirror each other, and the 6TBs would mirror each other too.
=
After some reading this would be configured as two separate RAID groups
and=
joined via a "storage pool", so not quite as simple, but
pretty =
much what I thought.</div><div>Total nominal storage would be
10 TB.</div><=
div><br></div><div>However, RAID 5 would=C2=A0get me
12TB nominal (4x 4TB -=
4TB) with the 6TB drives identifying=C2=A0as 4TBs within the array. Full 6=
TB capacity of the new drives would be realised when I replace the
existing=
4TB drives.=C2=A0</div><div><br></div><div>So
it looks like RAID 5 is the =
way to go?</div><div>I like the fault tolerance that RAID
provides but reco=
gnise that in itself it's not a complete backup
solution.</div><div><br=
></div><div>RAID 6 is higher fault tolerance but lower
capacity. RAID 10 (o=
r 01) is pretty much the "storage pool" solution I was
originally=
planning.=C2=A0</div><div><br></div><div>Is
there something obvious that I=
've missed, or is it RAID
5?</div><div><br></div><div>Thanks,<br>Tim.</=
div></div>
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d-color:#E3E3E3;">
Posted by: Tim Hawes <timsyahoo@xxxxxxx> <hr =
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