[mythtv-users] RAID5 ATA IDE hardware card recommendations for mythbackend machine

[Zachary Bedell]

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On Dec 16, 2004, at 10:01 AM, mielikki-ivtv wrote:
> Why bother.  Software raid easily outperforms any of these
> raid cards,  Its Robust, Mature, Universally Supported, Open Source
> and highly configurable.

Actually, I can tell you from my own experience that the Promise 
FastTrack SX 4000 was faster using its hardware RAID than Linux MD soft 
RAID.

Using the following as a rough benchmark:
date ; dd if=/dev/zero of=/mnt/array01/speedtest bs=1M count=1024 ; date

And running on an idle server, of course...

My HighPoint controller has been consistent at 30-32 seconds (about 
33MB/sec if my math is right?).  The Promise controller using its 
hardware RAID took 13-14 seconds (73MB/sec).  In software RAID (setup 
as JBOD with Linux MD RAID), the Promise controller takes 49-50 seconds 
(20MB/sec).

I'm *almost* wondering if it's worth setting the Promise back into 
hardware mode to use it for video transcoding.  I just use it to hold 
backups now, so I can deal with the Promise quirks without losing any 
data.

Best regards,
Zac Bedell

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