Re: RAID recommendations

You got something against my car???? It's got RAID 5 airbags too. ----- Original Message ----- From: "ART KAGEL, BLOOMBERG/ 65E 55TH" <KAGEL@bloomberg.net> To: <informix-list@iiug.org> Sent: Thursday, September 04, 2003 11:23 Subject: Re: RAID recommendations > Someone recently asked me why I like RAID10 over RAID5 and I finally came up > with an appropriate analogy to illustrate the point. So here for your > entertainment: > > Everyone knows that I am a devoted fan of RAID10. It provides the highest level > of data safety, read and write performance, and recovery time performance all > in one package. > > I will NEVER understand anyone selecting RAID5 these days with storage media so > cheap! With 146GB 10000RPM drives < $1000US and 36GB 10000RPM drives ~ $300US > how can you justify a 50% reduction in write performance to save a few bucks > that amortize over 5years or so (the safety and recovery issues which are FAR > more important aside)? If disk $$$ are really so dear I'd go for RAID3 or > RAID4. Here's an analogy to explain my understanding of the RAID10 versus > RAID10 issue at a gut level: > > Its like your car dealer offered you the option of a cheaper 5 cylinder engine > over the standard V8 to save 25% on the engine cost. It uses the same gas, gets > the same mileage in the city and only slightly less than the V8 on the highway, > top speed is the same as is flatland accelleration, but the car will slow down > by 50% when you climb a hill. Oh and BTW, here's the best part, it works great > when it's working and if one cylinder fails it can continue to run on only 4 and > a competent mechanic can even repair that one while the engine is still > running! However, if it loses a second cylinder, even to a simple spark plug > failure, before the first is fixed, then the engine will seize permanently and > become 400 pounds of iron junk likely throwing the car, you and your family into > a ditch to suffer life threatening injury. And folk JUMP at the chance! Ahh > well. > > Art S. Kagel > > > > sending to informix-list sending to informix-list

On Thu, 04 Sep 2003 22:14:25 -0400, Mark Denham wrote: So that means your car has five airbags and if one of them fails the others gather the pieces of your splattered brain and try to reassemble it? Art S. Kagel > You got something against my car???? > > It's got RAID 5 airbags too.