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RAID 5 or 6?

post #1 of 22
Thread Starter 
OK so my dad is building a server for his shop. He got a LSI Mega card and 6x RE4 drives.

Which would you choose? 5 or 6?

Pros and cons?

Thank you
    
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post #2 of 22
Check this out: http://www.overclock.net/t/484367/guide-all-you-ever-wanted-to-know-about-raid

RAID 6 will allow you to have 2 drive failures at once and the array will still have all the data and keep going. RAID 5 allows for 1 drive failure.

RAID 6 is more redundant
less space efficient

RAID 5 is usually gives slight better performance
less redundant
more space efficient.

Usually RAID 6 is for when you are using a bunch more drives. RAID 5 should be fine for the server unless you need more fault tolerance.
post #3 of 22
Quote:
Originally Posted by Sean Webster View Post

Check this out: http://www.overclock.net/t/484367/guide-all-you-ever-wanted-to-know-about-raid
RAID 6 will allow you to have 2 drive failures at once and the array will still have all the data and keep going. RAID 5 allows for 1 drive failure.
RAID 6 is more redundant
less space efficient
RAID 5 is usually gives slight better performance
less redundant
more space efficient.
Usually RAID 6 is for when you are using a bunch more drives. RAID 5 should be fine for the server unless you need more fault tolerance.

this ^^^^ is one very good explanation... or what you could do 2 x RAID 5 arrays and maintain approx the same amount of usable space as RAID 6 all the drives as well as maintaining fault similar fault tolerance since your data is stored on two separate arrays you get the best of both types as 3 x HDDs in RAID 5 has a less chance of complete failure than 6 x HDDs in RAID 5 so splitting the drives into two 3 x HDDs in RAID 5 arrays technically gives you the performance of RAID 5 and the tolerance of RAID 6... just another idea you can think about smile.gif
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post #4 of 22
Thread Starter 
Oh man blowing my mind right now. Lol Data Structures is my class for next quarter...

Thanks
    
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post #5 of 22
lol, I haven't even started my classes for this stuff yet myself. :/
post #6 of 22
Thread Starter 
I have like a year and a half left to get my Bachelors, These classes are the good ones tho, all Computer Science classes left lol
    
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post #7 of 22
Lucky, I'm doing Comp Engineering and I'm a freshman. All I have is bull prerequisites. -_-
post #8 of 22
Thread Starter 
Oh man that's the worse part lol. Just gotta muscle through them lol. Just pray you have teachers that are smarter then you, my Operating Systems and Photoshop teachers were quite a hassle lol
    
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post #9 of 22
Data structures is a good class.

Anyway, anyone care to comment about the RAID 5 write hole issue? I don't know anything about this stuff, but I'm planning on building a home server in the future. Also something OP might like to know.

It is caused by a drive failing or losing power before completing a write, right? Are there any other data corruption issues associated with RAID 5? From what I understand, this issue doesn't affect RAID 6, correct?
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post #10 of 22
Quote:
Originally Posted by WeirdSexy View Post

Data structures is a good class.
Anyway, anyone care to comment about the RAID 5 write hole issue? I don't know anything about this stuff, but I'm planning on building a home server in the future. Also something OP might like to know.
It is caused by a drive failing or losing power before completing a write, right? Are there any other data corruption issues associated with RAID 5? From what I understand, this issue doesn't affect RAID 6, correct?



It can effect any RAID array where information is stored in the controller's cache before it is finished being written to the disk.

 

Using a dedicated RAID card like the PERC 5/i or 6/i with a battery pack, or having a UPS on your system will prevent any failures like that from happening.

 

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