James Barrett on 7 Jun 2008 05:53:08 -0700

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Re: [PLUG] Mirrored drives with LVM

RAID on HW level - I am supposing you mean two RAID1 arrays?  Striping
with LVM... as in, two physical devices, one VG, and striping...

This is feasible.  I do not see how doing this would be any different
than RAID1+0 or RAID0+1, allowing you to lose two of four disks.  It
just depends on which disks you lose!  If you lose two disks in the
same array, all data is lost.  If you lose one disk in each array, you
still have all data.  Of course, I imagine that using LVM for the
striping allows you to add non-raided disks, which completely defeats
the purpose of using any raided disks.

If you choose RAID6 (2 parity), it will give different results.  You
still have the ability to lose 2 disks, but without discretion on
which are lost.  The downside of RAID6 is decreased performance.



On Sat, Jun 7, 2008 at 8:30 AM, Mag Gam <magawake@gmail.com> wrote:
> Slightly off topic question ...
> I see you are using RAID on LVM, what if I am using RAID on HW level and I
> plan to stripe on LVM level. Is this a good practice?
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