[mythtv-users] Storage Solution: Can ya help a brother out?

[Robin Hill]

On Mon Nov 24, 2008 at 05:34:16PM -0800, vamythguy wrote:

> one (other)
> thing Im unclear on where lvm is considered is what happens is i make
> the array part of a volume with other non-raid drives and
> later lose a device? i guess it is exactly the same whether a physical
> device is raid or not.  that makes sense. so, its just a crap shoot as
> to what is lost?
> 
If you have an LVM volume set up containing the RAID array and one (or
more) non-RAID drive(s), then you have the following scenarios:

- Lose a single drive from the RAID array.  If this is proper redundant
  RAID (i.e. not RAID 0) then this will result in no data loss.  The
  array will become degraded and performance will decrease until the
  drive is replaced and the array rebuilt.
- Lose a single non-RAID drive (or sufficient RAID drives to fail the
  array).  In this case you've most likely lost everything on the LVM
  volume (you can hack around to try and get partial volumes built and
  some data recovered but this isn't straight forward).

HTH,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <myth at robinhill.me.uk>  |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |
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