[mythtv-users] Fastest RAID for HD?

[Markus Schulz]

Am Samstag, 16. Februar 2008 schrieb Markus Schulz:

> i've built a system two weeks ago with:
>
> 6 * 73Gb 15k 2.5" sas in a smart array p400 (512MB cache) for a HP
> dl380 G5 system
>
> d1:/mnt/disk2# dd if=/dev/zero of=testfile bs=1M count=16384
> 16384+0 Datensätze ein
> 16384+0 Datensätze aus
> 17179869184 Bytes (17 GB) kopiert, 55,6692 Sekunden, 309 MB/s
>
> d1:/mnt/disk2# dd if=testfile of=/dev/null bs=1M
> 16384+0 Datensätze ein
> 16384+0 Datensätze aus
> 17179869184 Bytes (17 GB) kopiert, 56,1641 Sekunden, 306 MB/s

what i forgot:
until now i've never seen a HW-controller which can read with nearly 
N*drive_speed for raid10 setups. Perhaps a software raid10 can do this, 
i'm using md-raids only for simple raid1 setups where reads where 
spread relativly good (measured with iostat).
And i've never seen a similar setup with hw-raid5 with such a write 
performance or better read performance.

-- 
Markus Schulz