[mythtv-users] Should I use LVM on this new raid?
Jay R. Ashworth
jra at baylink.com
Mon Sep 24 12:53:59 UTC 2007
On Sun, Sep 23, 2007 at 10:10:01PM -0500, Brian Foddy wrote:
[ quoting me: ]
> > Evaluate carefully the relative cost of drives, as well, 5x500GB RAID5
> > may give you the same amount of storage for less money then 2x1TB
> > RAID0; the largest capacity *anything* is always more than twice the
> > price of the next one down half its size.
> > 500GB Seagate 7200.10s are about a bill right now.
> Yes I know the risks of RAID0, I've lived with a 5x RAID0 for
> probably 4-5 years now. As the budget allows, I'll add
> a couple more drives and migrate it to raid5.
> I was originally thinking the 500GB drives would be the way to
> go, primarily because of the very attractive price/size ratio. That's
> even why I paid extra for a 8 port raid card cuz I thought I'd
> be in the 5-8 drive range. But when I started looking around
> at other options there were a few factors that shifted my decision.
> 1. I discovered the new Seagate 1000GB drives are not just bigger,
> they are much better. 32MB cache vs 16, and the internal throughput
> is roughly 40% faster (~105 vs 70 (can't remember the units)). And
> they use less power / run cooler. They are a whole new generation
> drive vs even the 500/750GB perpendicular drives that are so cheap
> right now.
I hadn't actually looked at the 1TBs (I didn't actually realize Seagate
had gotten one out the door, honestly), so I didn't realize the price/
performance ratio jump was that steep. Yes, that sounds like a good
> 2. Since I wasn't buying all the drives right up front, I tried to guess
> what would be the drives I'd wish I had in 6-12 months, and what would
> be the sweet price/size ratio at the time, knowing once you pick a
> disk size in a raid, its very hard to change it unless you start a new
> unit or replace all the old drives. This clearly pointed to the 1000GB
> 3. The final price on the new drives, was actually not that far out
> of reach. New Egg has the ES.2 series 1000GB drives for $370 ea.
> Within reason of the price/size of an older series 500 ES.1 drive.
Twice as much storage for 3.7 times the cost... I dunno; that's still
pretty close to the edge. Sure, they'll get cheaper before you buy the
other three... but how much?
> These factors lead me to going with just 2 1000GB drives with
> number 3 and maybe 4 sometime in the next few months. I doubt
> the 2 drives will fail that soon, and even if they do, the data isn't
> that critical right away.
That there is probably the most important point.
My sister is an Archiver; everything on the drive is important.
Jay R. Ashworth Baylink jra at baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com '87 e24
St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274
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