[mythtv-users] Build for dual HD recordings - also is PSU enough/too much
Tom Bongiorno
two.bits.11 at gmail.com
Mon Mar 14 19:35:22 UTC 2011
On Mon, Mar 14, 2011 at 2:37 PM, Neil Cooper <neilcoo at yahoo.co.uk> wrote:
>
> You need to consider the worst case situation of recording 2 HD shows concurrently, during playback of another HD show while maybe also doing advert detection/transcoding in the background and remaining responsive to other activity such as input from a remote and/or slave frontends.
> One harddrive isn't going to cut it. It will definately be the bottleneck.
Is this really true? In prime time I am often recording 3 to 4 HD
shows and watching 1 to 2 from one hard drive with no problem. My
hard drive is a regular 7200RPM 1.5TB Seagate. I am also on a gigabit
network.
Lets say we have 5 five stream going in either direction at worst case
20Mbps each. That is 100Mbps or 12.5MBps. That doesn't seem high for
a drive. I have Comcast, and they don't broadcast anywhere near
20Mb/s per stream. It has been a while since I checked, but if I
remember correctly, they broadcast in the 8-12Mbps range for HD. If
they average 10Mbps per stream, then that is 50Mbps or 6.25MBps worth
of reads and write to the hard drive.
Correct me if I am wrong because I could be doing some bad math.
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