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Author Topic: need raid suggestions  (Read 6269 times)

urgannagru

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need raid suggestions
« on: April 05, 2009, 03:54:41 PM »

i am getting a new batch of HDDs. is it possible to have a mirrored spanning raid? lets say i order 4 drives. i span 2 of them. i then raid 1 (mirror) the entire span. can it work that way?

i could do raid 5, but the redundancy has a better chance of failing i think right? is raid 6 what i am looking for?

i really want have 1 drive for the htpc, but i am amazed at how a 2tb drive can cost almost 3x as much as a 1tb. i also have plenty of sata ports, a beefy psu, and a huge case with good cooling.
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blafrisch

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Re: need raid suggestions
« Reply #1 on: April 05, 2009, 06:19:32 PM »

What is it that you actually want?  Obviously some kind of redundancy, but you aren't very clear.

If you have N (N >= 4) drives then you can do RAID 0+1, 1+0, 5, or 6 assuming your controller supports these.

Advantages of:
0+1: Slightly enhanced performance, can easily handle any drives on one side of mirror dying
1+0: Slightly enhanced performance, can easily handle any drives dying so long as not all drives in a mirror die
5: Effectively (N-1) drives worth of space, can easily handle any 1 drive dying
6: Effectively (N-2) drives worth of space, Can easily handle any 2 drives dying

Disadvantages of:
0+1: Only 1/2 drives are usable, Drives dying in different stripes kills it
1+0: Only 1/2 drives are usable, All the drives dying in a mirror kills it
5: Can only handle 1 drive failure, Slower performance that 0+1 and 1+0
6: Slower performance than RAID 5, Only 1/2 drives are usable

For a HTPC I'd actually say RAID 5 would be my choice.  I use RAID 5 in my home server.
« Last Edit: April 05, 2009, 06:26:42 PM by blafrisch »
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urgannagru

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Re: need raid suggestions
« Reply #2 on: April 05, 2009, 08:14:12 PM »

i want:
100% redundancy (or as close as i can get)
a bunch of drives to look like 1 drive letter

i am not really sure how else to word it
« Last Edit: April 05, 2009, 08:16:27 PM by urgannagru »
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blafrisch

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Re: need raid suggestions
« Reply #3 on: April 05, 2009, 09:19:41 PM »

All of those would make it seem like a single drive: 1 drive letter.

Not so sure what you mean 100% redundancy.  All of them offer redundancy of at least 1 drive failure.  In other words, if 1 drive dies everything still works, you can replace that drive, and the RAID array is rebuilt.
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bliq

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Re: need raid suggestions
« Reply #4 on: April 08, 2009, 01:02:03 PM »

You're not looking for enterprise redundancy and RAID 6 basically means you throw away 2 drives worth of space.  R1+0/0+1 is really necessary when top performance is required but for HTPC that's not really the case.  Sounds like R5 is the way you really want to go.
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urgannagru

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Re: need raid suggestions
« Reply #5 on: April 08, 2009, 02:19:10 PM »

I really never want to lose any of this data though, and would be willing to sacrifice an extra drive. I guess I'll go with raid5 since it seems to be what the cool kids are all doing.
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bliq

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Re: need raid suggestions
« Reply #6 on: April 09, 2009, 12:40:32 PM »

I really never want to lose any of this data though, and would be willing to sacrifice an extra drive. I guess I'll go with raid5 since it seems to be what the cool kids are all doing.

Not only that, RAID 6 support doesn't seem to be that common outside of enterprise level solutions.  If you never want to lose the data, then you're going to need backup.  maybe offsite :)
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blafrisch

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Re: need raid suggestions
« Reply #7 on: April 09, 2009, 01:39:13 PM »

Not only that, RAID 6 support doesn't seem to be that common outside of enterprise level solutions.  If you never want to lose the data, then you're going to need backup.  maybe offsite :)

Yea, good luck finding a controller that supports it for a consumer level price.
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