[mythtv-users] ATA RAID Question
Jarod C. Wilson
jcw at wilsonet.com
Mon Mar 15 21:53:39 EST 2004
On Mar 15, 2004, at 18:07, Karl Rautenstrauch wrote:
> I am looking for a recommendation for an ATA RAID controller. Anyone
> have a pleasant experience with one they would like to share?
Most of them suck, unless you shell out lots of cash for a high-end
one. The pseudo-RAID cards have really poor drivers, and do almost
everything in software anyhow, so they hold very little benefit over
getting a $30 Promise ATA card and using Linux software RAID, which
actually does an extremely good job (and often out-performs those
pseudo-RAID cards).
> Also, any opinions on whether this would make a difference in a system
> with 512 MB of RAM and a PVR-250?
Not really. One card doesn't even come close to maxing out the
throughput of a single ATA drive.
> In read/write intensive apps like Oracle OLTP databases, we see a huge
> improvement with RAID 1 or RAID 1+0 and Myth seems fairly IO intense
> while recording or buffering Live TV. Thanks in advance.
You might see a decent gain switching your recordings partition to XFS,
JFS or ReiserFS, if you happen to be using ext3 right now. I used to
have a two-drive stripe in my system (for capacity, not performance)
and see no difference between that setup and my current single-drive
(WD 250GB/8MB cache) setup, with two simultaneous recordings in
progress while playing back a 3rd stream.
--
Jarod C. Wilson, RHCE
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