[mythtv-users] Dec 2008 - State of the Art - Hard Drive Recommendations?

[John Drescher]

On Wed, Dec 17, 2008 at 11:43 AM, John Drescher <drescherjm at gmail.com> wrote:
>>> Interesting. Any idea what a typical CPU overhead might be for a typical soft raid option?
>>
>> Depends on your CPU. A Quadcore Q6600 CPU is capable of handling parity calculation at > 4000 MB/s using just one core - this would translate to CPU usage of <1% of one core for the througput needed for an HD recording.
>>
> With software raid6 and 5 year old 2.0GHz opteron systems I see around
> 7% cpu usage in a 10 drive raid6 array. So my advice is if you have a
> modern cpu this will not be a concern.
>

I should have said 7% cpu usage max for the raid unless you are doing
a rebuild. And in that case it may go to 20% depending on how fast you
want the rebuild to finish. This is a user settable parameter.

John