[mythtv-users] Setting up a separate server to store recordings.

Kevin Kuphal kkuphal at gmail.com
Wed Oct 22 17:55:24 UTC 2008


On Wed, Oct 22, 2008 at 12:21 PM, C. R. Oldham <cro at ncbt.org> wrote:

>
> On Oct 22, 2008, at 11:01 AM, Paul Kidwell wrote:
>
> >
> > I tried setting it up with various flavors of Linux with no success.
> > RocketRaid says their board
> > has linux drivers, but I failed in every attempt to get it running. RR
> > tech support told me I had
> > the wrong type hard drives. (i.e. they blew me off)
>
> My recommendation is that you ditch hardware RAID and use Linux kernel
> RAID support.  It is very reliable and fast.  Consider the following:
>
> 1. What will you do if the RAID card goes bad?  You will likely lose
> your entire array.  Even if you replace the RAID card my experience
> has been if the new card is not identical in every way, it may not see
> the array on your disks.  Linux RAID doesn't have this problem.  If
> the machine that hosts your array keels over, you just have to attach
> your individual disks to any other Linux machine with a similar kernel
> revision and tell the MD system to assemble the array and you have
> access to your data again.
>
> 2. Storage is cheap, I recommend using RAID 10 instead of 5.  With
> RAID 10 you can lose 1 or possibly 2 disks and still have access to
> your data.  With RAID 5, you can only lose 1 disk.


It isn't that cheap.  RAID 10 is stripping on mirrors so you're still buying
double your usable storage.  RAID 6 is a better option.  2 disk failures but
you only lose a % of your usable space due to double parity.

Kevin
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