[mythtv-users] Hard Drive reliability esp. RAID issues

[John Drescher]

On Tue, Mar 9, 2010 at 10:41 AM, Travis Tabbal <travis at tabbal.net> wrote:
>
>
> On Mon, Mar 8, 2010 at 8:52 PM, John Drescher <drescherjm at gmail.com> wrote:
>>
>> >> Do you need better performance? A 14 drive linux software array of 1TB
>> >> drives should net you at minimum 500MB/s writes with 600 to 800 MB/s
>> >> reads.
>> >
>> >
>> > Guess there is something seriously wrong with mine then... I have a 14
>> > drive
>> > array with 500GB drives, software RAID, and I am lucky to get 120 MB/s
>> > (measured using dd). Do you have any tips/suggestions on how to speed it
>> > up?
>>
>> Are all drives on the pci-e based sata controllers? What CPU?
>
>
> And what type of RAID? 5/6 are slower than 10 would be, for example.
>

raid5 and it will have faster sequential writes and reads than raid 10
but slower random reads and writes. You can avoid some of the random
write penalty by extending the stripe cache.

John