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Why RAID at all?

post #1 of 75
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I have about 8 TB of Western Digital storage, using an ASUS Crosshair IV Formula board with an AMD 1090T (6-core), 16 GB RAM and 160 GB SSD for OS/Programs. I use Acronis and back up enough to satisfy my nagging OCD.

Why, then, would I even be attracted to RAID especially when this is what Wikipedia says about RAID-0, which we all know is not true RAID:
Quote:
RAID 0. Any disk failure destroys the array, and the likelihood of failure increases with more disks in the array (at a minimum, catastrophic data loss is twice as likely compared to single drives without RAID). A single disk failure destroys the entire array because when data is written to a RAID 0 volume.
http://en.wikipedia.org/wiki/RAID

Please understand that I am not trying to denigrate any RAID users; I just want to know if it would be helpful for me.
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post #2 of 75
when your drives don't hold any critical data and what you want is speed RAID0 is nice.
 
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post #3 of 75
Raid 0 isnt the only kind of array, you can build arrays where multiple hard drives can fail and you will still be ok. The 2 main features of raid are redundancy and increased speed, the level of both of these changes based on the type of raid used and the number of drives.
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post #4 of 75
I have a 4 way raid 0 for my OS
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post #5 of 75
you would never raid0 storage drives....

and there is almost no point since you already have an SSD for your OS...

Raid0 is really just for like high speed volumes for an OS or something that requires accessing a ton of information almost instantly like editing HD raw video streams (in which case a monster array of ssds running off a good controller would be a decent option)...

for storage drives you could do something like raid5 or raid6 if you had enough hard drives... those would provide striped drives w/ distributed parity and allow you to suffer a single (raid5) or dual (raid6) drive loss and still not lose your data.

Raid5/Raid6 are not very practical though unless were talking a high end raid controller being purchased along with the drives.

You should read into it more... there is alot more to raid than just raid0.
    
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post #6 of 75
There is several different types of raid.

I think RAID 5 copies the exact data on both drives and can still be as fast as RAID 0, RAID 0 again puts half on HDD1 half on HDD2. This is why data gets corrupted if one fails in a RAID 0 setup.

Downside with raid 5 is less storage, as it's the same as you still only had one drive (sizewise) Also, RAID 5 is ideal for backup since one can fail and you'll still have the data.
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post #7 of 75
That's just RAID 0 though. 2x RAID 0 effectively doubles your read/write speed.

(I'm assuming you have 4x 2TB drives, correct me if I'm wrong)

There are other types of RAID though. RAID 1 mirrors one drive onto another. You'd only get 4TB total storage, but you could handle up to 2 drive failures (1 on each array) as the data from the first drive is mirrored on the second.

There's also RAID 5 (using at least 3 drives) and that increases you read speed, but not your write. It can handle 1 failure as well.

RAID doesn't have to be just about speed, in fact it was created for redundancy. (Redundant Array of Identical Disks)
Edited by MetalBeerSolid - 1/3/11 at 12:21pm
 
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post #8 of 75
I use Raid0 on my SSDs, but with the SSDs failure is not really an issue.
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post #9 of 75
Thread Starter 
Quote:
Raid 0 isnt the only kind of array
This I well know. Is it a fair question to ask which would be the best for someone who develops educational programs for gifted students and cannot afford to lose any work. Acronis is just wonderful, but NOT if a critical HD goes south on you.

Also, I am NOT a gamer (and please don't read into that any opinion. Some of my best friends are insane gamers and we manage to tolerate each other quite nicely. )

Btw, I learn something from each and every one of your responses, so THANKS!
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post #10 of 75
raid is either for speed or critical storage.
Speed=1 drive fails you loose everything.
Storage= drives fail you still got your info. And you loose 50% of total size.

Quote:
This I well know. Is it a fair question to ask which would be the best for someone who develops educational programs for gifted students and cannot afford to lose any work. Acronis is just wonderful, but NOT if a critical HD goes south on you.
Raid1
It is also recommended to use hardware raid.
Edited by DiNet - 1/3/11 at 12:19pm
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