Issue with RAID

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tylerslusarek

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Aug 29, 2013
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Hi,

I'm fairly new to the raid scene, this is the issue I am having.

I built a machine with x2 1TB drive and successfully created a raid recovery hard drive I would say what level of raid I used, but the option I used was called"recovery" on the raid manager. I would like to say RAID 5 but my research tells me raid 5 requires 3 physical drives. Anyways that was successful. HOWEVER the client I am building this for wanted an additional x2 2tb hdd's added and wanted one to be a backup hard drive in case one fails. Once I go back into the RAID manager its saying error "max number of volumes reached"

Please forgive the lack of knowledge about RAID, any help would be very appreciated.
 
Solution
geofelt
I suspect recovery means raid 1 or mirroring.
That means that the first drive gets duplicated on the second. That gives a max of two.

If you have 4 drives available, you could use raid 5 which is a parity striping strategy that will let you rebuild the array onto the spare drive if one of the original drives fails.

What is the client's need for such redundancy? The mean time to failure advertised for hard drives is in the area of 50000 hours, perhaps 20 years.Normally, raid is only appropriate for a server where any down time is critical.
Raid does not protect from such perils as viruses, malware, fire, operator error...

For that, you need some sort of external backup.
If recovery is not time sensitive, perhaps a simple external...
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geofelt

geofelt

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Oct 9, 2006
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I suspect recovery means raid 1 or mirroring.
That means that the first drive gets duplicated on the second. That gives a max of two.

If you have 4 drives available, you could use raid 5 which is a parity striping strategy that will let you rebuild the array onto the spare drive if one of the original drives fails.

What is the client's need for such redundancy? The mean time to failure advertised for hard drives is in the area of 50000 hours, perhaps 20 years.Normally, raid is only appropriate for a server where any down time is critical.
Raid does not protect from such perils as viruses, malware, fire, operator error...

For that, you need some sort of external backup.
If recovery is not time sensitive, perhaps a simple external backup strategy may be better.
 
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Solution
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tylerslusarek

Honorable
Aug 29, 2013
11
0
10,510


It very well may be RAID 1 but thanks to Intel they want your to figure it out for yourself.. So if i do raid 5 will this work with different hard drive sizes? x2 1tb and x2 2tb? This is a sever for a small business this will be replacing their old tape server and reliability is a MUST with is why I chose to do raid.
 
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_BigHead_

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Jun 4, 2013
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Honestly the best thing you can do is head over to the wikipedia page on raid a thoroughly vet yourself on all the goodies that are available in raid. That being said, the controller you're using may or may not support ALL of the various types of raids that are out there.
Wikipedia.org/wiki/RAID
its a lot of reading but its good information.

For your work you would probably be golden with a Raid 1+0 setup if its supported. Basically with 4 total drives (as a minimum) you can have two drives in raid 0 to one another for optimum performance, and then the other two drives are a mirror of that raid 0 array.

So you have drives A, B, C, and D. A is in raid 0 with drive B. then drive C is a mirror (raid 1) with drive A, and drive D is a mirror to drive B. Make sense? You'll have to look up on google... or click this. How To Setup Raid 1+0
 
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