[mythtv-users] NAS RAID 5 for MythTv

[Kevin Kuphal]

Gareth Glaccum wrote:
> If he is intent on Raid 5 and lvm, then he may be contemplating using the 
> LVM for the parity. This would reduce the number of hard disks lost to 
> parity wouldn't it?
> For example, 12 disks on 3 machines.
>
> 1) Each seperate machine has 4 disks, raid 5, and then stiped = 3 disks lost 
> to parity
> 2) If LVM were to be done across the network, (in theory) only 1 disk lost 
> to parity.
>
> Obviously, if you could afford 12 disks, it would be a lot more sensible to 
> go for a fibre attached raid or proper NAS
>   
I guess my point is, no matter what, you're risking the entire LVM array 
if you lose the disks and with network attached storage, a "lost" disk 
is as little as a lost network connection.   With storage groups, a lost 
disk means you only lose the content on that drive, not the entire 
filesystem.

Kevin