[mythtv-users] Hardware Setup Advice

[David Crawford]

Thanks a lot for the info..

I'm using a seagate blackarmor NAS 110 at the moment. It actually works
pretty well and has been for some time, but i guess i could do with another
drive or 2 since i have 2 systems and I'm actually thinking of using the
other as a secondary backend if i can mythtv working stable enough.

So my thinking right now is:
OS and database on SSD (is this a must?),
add another internal HDD like seagate pipeline or constellation 2,
split storage between the 2 HDD's and the NAS.

What about transfering the files over to the NAS's to free more space on
the local HDD's? Would that be preferable you think?

David

On 23 May 2012 15:30, Andre <mythtv-list at dinkum.org.uk> wrote:

>
> On 23 May 2012, at 14:53, Simon Hobson wrote:
>
> > David Crawford wrote:
> >
> >> However I'm sure there will be problems down the line as I have another
> PC setup with windows software with the same hardware and it encounters
> problems also when recordng many streams.
> >
> > Your biggest issue will be disk seek times. Essentially, if you are
> recording 18 streams, then you have 18 threads which are syncing a file to
> disk once a second. This means the disk will be trying to do 18 seeks &
> writes/second - and a cursory look at the specs of most disks will reveal
> that this is likely to lead to a bottleneck.
> > It's not the basic data rate that's the issue, it's the quantity of
> seeks that kills performance.
>
> David I also find that in general AV specific drives work much better than
> generic consumer drives, I have many WD AV-GP and Seagate Pipeline drives.
> I find I am able to record 19 simultaneous HD streams across 5 disks
> without expensive hardware.
>
> I also use MythTV in a broadcast environment, feel free to contact me off
> list if you think that would be useful.
>
> Andre
>
>
>
> >
> > Adding additional disks, each in a separate storage group, will spread
> the I/O load across multiple drives and you should have a lot less of a
> problem.
> > Eg, if you add two more drives, then you'll end up with around 6
> streams/drive - if you can "about manage" now on 18, then around 6 should
> be no problem. Even a second drive should help.
> >
> > As for using a NAS, it depends very much on it's performance. Remaining
> polite, some NAS boxes "perform poorly", and it also varies with access
> method (SMB vs NFS vs AFP vs ...).
> >
> > --
> > Simon Hobson
> >
> > Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> > author Gladys Hobson. Novels - poetry - short stories - ideal as
> > Christmas stocking fillers. Some available as e-books.
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> >
>
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