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Why RAID at all? - Page 2

post #11 of 75
Quote:
Originally Posted by MetalBeerSolid View Post
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 or capacity. 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)
Thanks for that, I might have spread some misinformation
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post #12 of 75
Quote:
Originally Posted by tconroy135 View Post
I use Raid0 on my SSDs, but with the SSDs failure is not really an issue.
Orly? My vertex 2 failed within 48 hours of owning it.
 
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post #13 of 75
Quote:
Originally Posted by incurablegeek View Post
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: 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.
RAID 0. Any disk failure destroys the array - this true but i back up my data
RAID 0. When properly set up it is fast!!!
    
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post #14 of 75
Quote:
Raid5/Raid6 are not very practical though unless were talking a high end raid controller being purchased along with the drives.
Or not.

As stated, there are RAID levels other than simply 0.
The original concept of RAID was to have a certain amount of Redundant data.
I'd link you the wikipedia article, but it looks like you've already "read" it..

With 8 TB of data, you'd be well off having some sort of failure mechanism. RAID 5 will tolerate one drive failure. It does this by distributing parity data across all of the drives. If any drive in the array dies, you can replace the drive and the data will rebuild from the parity calculations. The only stipulation with RAID 5 is that now your write performance takes a gigantic hit as you have to calculate parity data and write it every time you write a file. This data takes up the drive space of one of the array members.
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post #15 of 75
Quote:
Originally Posted by incurablegeek View Post
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!
Depending on your drive setup, I'd say RAID 1 would suit you perfectly. You'd only be able to use 4TB, but all of your data would be backed up every time you changed anything. So if a drive fails, everything that you've done or changed up until the failure is backed up.
 
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post #16 of 75
why not do raid 1+0
post #17 of 75
Quote:
Originally Posted by beers View Post
Or not.

As stated, there are RAID levels other than simply 0.
The original concept of RAID was to have a certain amount of Redundant data.
I'd link you the wikipedia article, but it looks like you've already "read" it..

With 8 TB of data, you'd be well off having some sort of failure mechanism. RAID 5 will tolerate one drive failure. It does this by distributing parity data across all of the drives. If any drive in the array dies, you can replace the drive and the data will rebuild from the parity calculations. The only stipulation with RAID 5 is that now your write performance takes a gigantic hit as you have to calculate parity data and write it every time you write a file. This data takes up the drive space of one of the array members.
Ohh, now I understand how RAID 5 works. I though it was more of RAID 0 (without the capacity increase) + 1
 
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post #18 of 75
Thread Starter 
Quote:
Raid1
It is also recommended to use hardware raid.
Now that is hugely helpful. Something to look into.
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post #19 of 75
Looks at his array... useless!
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post #20 of 75
Quote:
Originally Posted by kga92 View Post
Downside with raid 5 is less storage, as it's the same as you still only had one drive (sizewise)
False. You lose one drive's worth of capacity due to parity, therefore would retain 6 TB of storage, assuming you are using 4x 2 TB drives.

Also assuming you are using 4x 2 TB drives:

Simply adding all of his drives to RAID 1 would create a mirror among 4 drives. All members of the array would have exactly the same data, and would effectively have 2 TB (one drive's worth of space to work with).

RAID 10 (or 1+0) would likely have the best performance in this scenario, as it stripes data between two drives, and performs an exact mirror of this "RAID 0" array on the other two drives. The only downside is that you only have 4 TB to work with. You can handle two drive failures as long as they are in the same RAID 0 array. If you lose two drives on opposite ends of the mirror then your entire data emporium is toasted.

RAID 5 would be a good compromise, especially for a general storage approach, as you retain 3x the drive storage (6 TB total) and can handle a drive failure. Read speed is high while the write speed is mediocre. Still, you would be able to nearly saturate a gigabit link (~110-120 MB/sec after overhead) doing writes over a network to a 4 member RAID 5 array.

My 4x 750 GB RAID 5 array has been humming along nicely since around March.
At 90% capacity, sequential reads are ~200 MB/sec.
This is using software RAID with mdadm under Linux.
Edited by beers - 1/3/11 at 12:53pm
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