[mythtv-users] RAID5 ATA IDE hardware card recommendations for
mythbackend machine
Zachary Bedell
zaclist at adirondack.net
Thu Dec 16 18:17:10 UTC 2004
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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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