

11212009, 02:40 PM

#21 (permalink)

Master Techie
Join Date: Jul 2005
Posts: 2,400

Re: My new build.........
Quote:
Originally Posted by Druid
Well, the is risk is no higher than if you just have one HDD then.

Not quite.
If the probability of an HD failing is 1%; then the probability of one of two HDs failing is 1 + 1 = 2%. The probability of both HDs failing simultaneously is 0.01% (which isn't important here). So yea, there is a higher chance of losing your data: 2% raid 0 vs. 1% for a single drive. I arbitrarily chose 1% since i don't really know what the probability of an HD failing is...
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11212009, 05:27 PM

#22 (permalink)

Monster Techie
Join Date: Oct 2005
Location: Planet Earth.
Posts: 1,274

Re: My new build.........
Since this post is turning out to be about hard drive failures, I read a really good study Google did on HDD failures in their servers, but I didn't bookmark it. Has anyone came across this?
To echo what others have said, RAID0 es no bueno. No one likes losing half of their data over a hard drive failure. If you insist on wanting to strip there are other RAID levels that provide stripping as well as parody. But just a warning, they become elaborate compared to a simple RAID0. Just google "RAID levels".
For a nice, simple, but a more expensive setup, I like SSD and one HDD. SSD for OS and software and the HDD for media and/or software if the SSD gets full.
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Back on being mobile  ASUS G551 15.3" 1080p  Core i7 4710HQ  GTX 860M  16GB DDR3 1600  512GB Samsung 850 Pro  Steam ID: TheOtis



11212009, 07:00 PM

#23 (permalink)

Super Techie
Join Date: Dec 2005
Location: Massachusetts
Posts: 458

Re: My new build.........
Quote:
Originally Posted by aliasaid
Not quite.
If the probability of an HD failing is 1%; then the probability of one of two HDs failing is 1 + 1 = 2%. The probability of both HDs failing simultaneously is 0.01% (which isn't important here). So yea, there is a higher chance of losing your data: 2% raid 0 vs. 1% for a single drive. I arbitrarily chose 1% since i don't really know what the probability of an HD failing is...

Well that isnt quite right either, like i said i used to know this but forgot.
If we take your theory, than two things with 50% would be 50% + 50% = 100% of happening.
This isnt true, as if you flip a coin, it has 50% of landing tails. If you flip it and it lands heads, the next time you flip it, its not guaranteed to land tails.
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Intel E8400
Zalman 9500AT
evga 8800gt dualslot cooler
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gigabyte p43ds3L
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200gb Seagate HDD, 500gb Seagate HDD, 1TB Seagate HDD



11212009, 07:17 PM

#24 (permalink)

Techie Beyond Description
Join Date: Dec 2006
Posts: 19,993

Re: My new build.........
Don't you take the fraction multiply it by the other fraction?
So it's really 1/4 chance that your data goes bad?
It's just easier to get a cheap used Raptor or RaptorX Drive as your primary and your secondary to be something else or maybe find a SCSI drive (and the adapter) to use as your primary.



11212009, 07:18 PM

#25 (permalink)

True Techie
Join Date: Oct 2007
Location: Vancouver, BC
Posts: 184

Re: My new build.........
Both really are the same processor with the multiplier jumped up one (which you can do yourself since the 955 has an unlocked multiplier).
Here's the hierarchy of the performance: Core i5 > Phenom II = Core 2 Quad
Then the 955 is better, cause it's cheaper. I didn't know the Phenom II = Core 2 Quad; I thought the Phenoms were between the Core2Quad and i5..........
As for the probability stuff; if I remember from my statistics correctly......... say it's a 5% chance of a HD failing; the probabilty of both HD's failing in raid 0 would be 0.05x0.05= 0.0025; which is 0.25% chance of BOTH failing.......... but this is the probaiblity of BOTH HD's failing.
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1GB WD Black
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Corsair 750W Modular P/S
Samsung T220
Scythe Kaze Master Ace Fan Controller
Genius SW5.1 1505 Speaker System
Windows 7 Professional 32bit.



11212009, 07:26 PM

#26 (permalink)

Techie Beyond Description
Join Date: Dec 2006
Posts: 19,993

Re: My new build.........
Well it really depends on which Quad you are comparing to.
Some of the Core 2 Quad's are the same performance as the PII's, some are faster and some are even a good bit slower.
But the i5 is significantly faster for $10 more, but then you'd have to pay for DDR3 and the LGA1156 boards.



11212009, 07:38 PM

#27 (permalink)

True Techie
Join Date: Oct 2007
Location: Vancouver, BC
Posts: 184

Re: My new build.........
Vernong,
If I go AMD route, I'll go
Phenom II 955be  #200
Crosshair 3 forumla $225
Dominator GT AM3 $240......... that's $665 CAD.
If I go i5; what components can I get that would be $665 +/ $30?
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CM Haf 932
Intel i7860
Asus Maximus 3 Forumula
2x2GB Corsair Dominator GT
XFX 6870 Dual Fan
Intel 80GB SSD
1GB Seagate 7200.12
1GB WD Black
Thermalright Venomous X
Corsair 750W Modular P/S
Samsung T220
Scythe Kaze Master Ace Fan Controller
Genius SW5.1 1505 Speaker System
Windows 7 Professional 32bit.



11212009, 08:57 PM

#28 (permalink)

Master Techie
Join Date: Jul 2005
Posts: 2,400

Re: My new build.........
Quote:
Originally Posted by bkolk
Well that isnt quite right either, like i said i used to know this but forgot.
If we take your theory, than two things with 50% would be 50% + 50% = 100% of happening.
This isnt true, as if you flip a coin, it has 50% of landing tails. If you flip it and it lands heads, the next time you flip it, its not guaranteed to land tails.

Yes you're right. But if you look carefully, you'll see that i said the chances of 1 of 2 hard drives failing would be 1 + 1, i didn't say that BOTH failing would be 1 + 1.
Quote:
Originally Posted by TheGlazer
[I]
As for the probability stuff; if I remember from my statistics correctly......... say it's a 5% chance of a HD failing; the probabilty of both HD's failing in raid 0 would be 0.05x0.05= 0.0025; which is 0.25% chance of BOTH failing.......... but this is the probaiblity of BOTH HD's failing.

Yea thats what i did 0.01 X 0.01 = 0.0001; which is 0.01% for BOTH of them failing
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"Is virtue a thing remote? I wish to be virtuous, and lo! Virtue is at hand." Confucius



11222009, 12:31 PM

#29 (permalink)

True Techie
Join Date: Mar 2009
Location: Pennsylvania, USA
Posts: 248

Re: My new build.........
P(x) means probability of x
p(drive1 or drive2) = p(drive1) + p(drive2)  p(drive 1 and 2)
p(drive1 and drive2) = p(drive1) x p(drive2)
given probable chance of failiure is 2%
.02 + .02  (.02 x .02)
.02 + .02  .0004
.04  .0004
.0396
3.96% chance that either drive will fail.
to clarify the 50% chance thoughts...
.5 + .5  (.5 x .5)
.5 + .5  .25
1.0  .25
.75 = 75% chance of failure if both have 50% chance each.
Hope i helped
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11222009, 01:07 PM

#30 (permalink)

True Techie
Join Date: Oct 2007
Location: Vancouver, BC
Posts: 184

Re: My new build.........
P(x) means probability of x
p(drive1 or drive2) = p(drive1) + p(drive2)  p(drive 1 and 2)
p(drive1 and drive2) = p(drive1) x p(drive2)
given probable chance of failiure is 2%
.02 + .02  (.02 x .02)
.02 + .02  .0004
.04  .0004
.0396
3.96% chance that either drive will fail.
to clarify the 50% chance thoughts...
.5 + .5  (.5 x .5)
.5 + .5  .25
1.0  .25
.75 = 75% chance of failure if both have 50% chance each.
Hope i helped
Stats 101 all over again, LOL!
I did some research, and found out it's cheaper to get
i5750, Maximus Formula 3, Dominator GT ddr3 then.......
phenom II 955, Crosshair 3 forumula, dominator GT ddr3.........
Went to newegg.ca......... i just don't know how much they charge for shipping.......... anybody here from canada? and has ordered from newegg.ca??? I'm from vancouver, bc
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CM Haf 932
Intel i7860
Asus Maximus 3 Forumula
2x2GB Corsair Dominator GT
XFX 6870 Dual Fan
Intel 80GB SSD
1GB Seagate 7200.12
1GB WD Black
Thermalright Venomous X
Corsair 750W Modular P/S
Samsung T220
Scythe Kaze Master Ace Fan Controller
Genius SW5.1 1505 Speaker System
Windows 7 Professional 32bit.





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