Grant Horning wrote:
Let me clarify...
Software RAID 5 will consume approx 20% cpu under a heavy I/O
load. The disk performance will be very good but you must remember that
cpu time is also very important. With dual cores, software raid 5 won't
be a problem at all. With a single core, I would be worried about maxing
out the cpu. You can see some benchmarks at
http://www.chemistry.wustl.edu/~gelb/castle_raid.html
Also, don't worry about the onboard raid chip. You wont be using it
anyway. Linux has its own software raid. Try 'man md'.
Thanks. I said "software RAID" (and meant "md") so I'm not sure where
anyone got the idea that I was considering on-board RAID. I'm not.
I can't imagine why disk performance would be an issue. A 10000 RPM
disk used as a daily write cache surely is unnecessary -- even at HDTV
rates this isn't a huge amount of bandwidth by modern disk drive
standards. I'm considering RAID5 so that losing a hard disk won't be
fatal to the video library.
My advice for a kick-ass system that will do more than just let you
watch HDTV.
Get dual cores
Get 2GB ram (see benchmarks)
Use software raid 5
Get a case with great airflow + lots of power
Pretty much what I was considering except for RAM. I'll look at the
benchmarks, though; RAM's not all that expensive.
I'm not sure if JFS or XFS perform the same as EXT3 or Reiser under RAID
5. That might be worth looking into.
Unless there's a good reason not to, I'll use XFS. I strongly prefer it
to ext3 for mythtv recordings.
Thanks,
Len
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