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

[Jake Anderson]

vamythguy wrote:
> On Sun, Nov 23, 2008 at 9:29 PM, Brad DerManouelian 
> <myth at dermanouelian.com <mailto:myth at dermanouelian.com>> wrote:
>
>     On Nov 23, 2008, at 9:14 PM, vamythguy wrote:
>
>     > Ok.  Let me start with - I don't get LVM + RAID.  The idea of being
>     > able to throw differently sized disks in one side and having a
>     > failure resistant dynamically extendable disk solution come-out the
>     > other is great, but I don't get LVM + RAID.  Specifically, how it
>     > works.  Why both?
>
>     Read more for your answer.
>
>     > Also, I love the idea of not being constained by the number of slots
>     > in a box, so the extent to which that can be abstracted across a
>     > protocol like iSCSI or AoE or eSATA would be great - especially
>     > since performance is only marginally important to me.  So, how
>     > would.does something like this work/get built?
>
>     There's your answer to the question above and the explanation above
>     answers the question here. That was easy.
>
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>
> Great!  All the pieces are in the box - so, how do you put them 
> together?  So I get how LVM let's me keep throwing disks at it, but 
> how do I get fault-resistance?  RAID, right?  But I don't think RAID 
> likes new disks, does it? So, maybe starting with how to get that to work.
> ------------------------------------------------------------------------
>
>   
Don't RAID your mythtv stuff.
Storage groups work much better in terms of disk IO/seeking when under 
load, as a result your disks will probably last longer.
HDD failures are so rare these days don't bother with it, worst case you 
loose some TV, you should have better things to do anyway ;-P

If you have some other stuff you want to do on the machine then split 
some disks into partitions, use some partitions for software raid 
(MDADM) and some for storage groups. That is what I have now (3x 320gb 
drives with a 60gb raid partition on each and the rest as XFS parts for 
storage group, boot is off a 20gb part on a 420gb disk with the rest set 
as a storage group). If you start with 3 disks in your RAID you get RAID 
5, you can add disks to raid5 arrays with mdadm now then grow the file 
system to handle the added space. If you pick a file system that 
supports online growth you can do that whole thing with 0 down time, 
pretty heavy performance hit though.

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