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Re: a question about RAID (2915 Views)
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Teacher
lmann
Posts: 262
Registered: ‎12-25-2008
Message 1 of 6 (2,930 Views)

a question about RAID

[ Edited ]

Hihi,  So I see this word RAID a lot and it is frequently coupled with the words increased performance and reliability and that catches my eye.  I want increased performance and reliability!  But what does RAID really mean, to me, a home user looking for a new system with all the oomph I can get to edit my hi-def vids. 

Here's two systems for your reference:

m9457c http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01570956&lc=en&dlc=en&cc=us&product=3815139&lan...

m9550f  http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01636219&lc=en&dlc=en&cc=us&lang=en&product=388...

I am looking specifically at the specs for the hdd.  One of those systems has one hdd = 1TB and the other has two hdd set up in a RAID = 1TB. 

 

So here's what I'm thinking.  With the RAID configuration I'll have increased performance and reliability, but I don't know how.  I guess it depends on which 'raid level' hp set the system up with?  Which one do you think hp used (relating to this wiki article: http://en.wikipedia.org/wiki/RAID) Any guesses?

 

And the other thing I'm thinking is that if one of the hdd fail in the RAID configuration then replacing one 500GB hdd is going to be cheaper than replacing the 1TB hdd if it fails.

 

And so that sounds good I guess but plz correct me if my thinking is wrong.  And what else should I be thinking about when choosing RAID vs non-RAID?

 

Thnks  :smileyhappy:

 

edit for additional information:  I would be using the vista 64-bit os that comes with

Message Edited by lmann on 01-10-2009 07:46 AM
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Master's Graduate
cnfrisch
Posts: 943
Registered: ‎11-24-2008
Message 2 of 6 (2,968 Views)

Re: a question about RAID

Why RAID is (usually) a Terrible Idea
http://www.pugetsystems.com/articles?&id=29

 

RAID Explained
http://www.pugetsystems.com/articles.php?id=24

Carey Frisch
Microsoft MVP
Windows Expert - Consumer

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Distinguished Professor
Kalt
Posts: 3,005
Registered: ‎11-19-2008
Message 3 of 6 (2,936 Views)

Re: a question about RAID

It depends on which RAID you choose.  There are only 2 types of RAID that a home user would use (The others are too complex and require more than 2 hard drives).  A RAID setup requires at least 2 hard drives.

If you want it striped (RAID 0), the performance will increase, but when 1 hard drive fails you'll lose all of your data and have to re-build the RAID array after replacing the failed drive.

If you want it mirrored (RAID 1), then it will not increase your performance at all...but if one drive fails you'll still have all of your data on the other drive.

As for the m9457c system posted...I didn't see anything about RAID...why do you suspect they've set it up that way?
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Teacher
lmann
Posts: 262
Registered: ‎12-25-2008
Message 4 of 6 (2,915 Views)

Re: a question about RAID

Very interesting and relevant articles cnfrisch.  ty!

 

Kalt!  You asked a very good question!  And of course the answer is that I just ASSumed that multilple hdd must=RAID..  when it could rly simply be JBOD (Just a Bunch Of Disks).  Ahaha.  I see that there is an Intel Matrix Storage Manager Driver Update for the multilple hdd machine.  Does that give us a clue as to whether or not there is a RAID setup?  Or is it that if there IS a RAID setup is that clearly identified?

 

And if is JBOD?  How is that relevant for my needs?  I guess one thing I was thinking if I had multilple hdd was to put my os on one and put data on the other to perhaps lessen the chances of os corruption?  Or is that not rly a relevant consideration?

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Distinguished Professor
Kalt
Posts: 3,005
Registered: ‎11-19-2008
Message 5 of 6 (2,912 Views)

Re: a question about RAID


lmann wrote:

Kalt!  You asked a very good question!  And of course the answer is that I just ASSumed that multilple hdd must=RAID..  when it could rly simply be JBOD (Just a Bunch Of Disks).  Ahaha.  I see that there is an Intel Matrix Storage Manager Driver Update for the multilple hdd machine.  Does that give us a clue as to whether or not there is a RAID setup?  Or is it that if there IS a RAID setup is that clearly identified?

 

And if is JBOD?  How is that relevant for my needs?  I guess one thing I was thinking if I had multilple hdd was to put my os on one and put data on the other to perhaps lessen the chances of os corruption?  Or is that not rly a relevant consideration?


No, even single HD units use the Intel Matrix Storage Manager...and I assume they'd identify it as a RAID setup.  As for JBOD - it gives you more space and if you have to reinstall the OS, you won't have to back the data up to another drive...as the secondary drive would not be messed with.

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Teacher
lmann
Posts: 262
Registered: ‎12-25-2008
Message 6 of 6 (2,898 Views)

Re: a question about RAID


Kalt wrote:
As for JBOD - it gives you more space and if you have to reinstall the OS, you won't have to back the data up to another drive...as the secondary drive would not be messed with.

The reverse would also be true, I suspect!  Thanks very much.  You've given me some good information on which to base my decision.  The largest hd file I have worked with is only 13GB and that is somewhat unusually large for me - so I don't think a raid configuration is going to make any performance difference for my needs.  And I don't think the mulitple hdd machine is RAID configured anyway.  I think it is JBOD - a bundle that was configured simply to use up the perhaps less desirable smaller 500GB hdds in stock.  Not that that's bad.  Just is a way for the manufacturer to save money - and that savings IS passed down in the price of the multiple hdd system where I am looking at it for sale.

 

:smileyhappy:

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