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Raid 0+1 question

S

shinji23

Limp Gawd
Joined
Feb 12, 2002
Messages
336
Hi, I have qutestion for all you raid gurus out there.

I am tryig to put together a file server for my company. Problem I am having is my boss wants to have 1 tera byte drive, and no one sells those yet. Largest hard drive I found was 500g. Is it possible run raid 0,1,with 6 500g hdd? My thinking is use 2 500g as 1 tera drive and raid them. I've never done anything like this and I couldn't really get any answers from here or on google.

Thank you.
 
with 6x500 gb drives, you could do raid 0+1 and have 1.5TB storage. You would need to get a good controller card to handle 6 cards though.

Another option would be to go Raid 5, which uses one drive for parity data. Raid 5 controllers are usually more expensive, but you could use 4 drives instead of 6 and still have 1.5 TB (3x500GB storage + 1x500GB parity), and use the money saved on drives to get a better controller card.
 
If speed is any kind of issue, go with raid 0+1 as you suggested; a highpoint controller will be plenty, they handle 8 drives (so you can get the cheaper 3 or 400gb models). Raid 5 is fine for capacity-demanding applications, but it lacks write speed. Not terribly, mind you, but if you're doing a database or something, 5 is right out. As Monty Python would say.

 
But that is what writeback cache coupled with much memory as you can fit in the controller is for! :D
 
Thank you all for your kind suggestion.

So this is what we are buying.

Supermicro SuperServer 6024-TRB 2U Barebone Server-Rackmount
Intel Xeon EM64T 3.2 Irwindale 800MHz FSB 2MB L2 Cache Socket 604 Processor
4 Corsair DDR 333 1gig Memory
6 Segate 500G hard drive
Adaptec 2020SA Raid card

Now, I am going to use 4 for raid, and other 2 for back up.

However, my boss brought up another interesting idea....

He is asking whether we can make another machine and mirror it. No clue what he is really asking me, but seems like he is looking to make another server for back up purpose and mirror all the data.

Any clue on my boss' question??
 
You could indeed build another identical machine and replicate everything onto it, but it's entirely a software function; there's no way to have hardware replication that I know of. Not a bad idea, though - maybe even put 4 disks in one (just the raid array) and 8 in the other, and make multiple snapshots onto the one with more disks. If you'd be interested in setting this up, post about it and I'll give you more information.

 
If this is for a company set up then I would suggest that you look to see if your controller will do RAID 10 not just 0+1 - i.e the data is mirrored before it is stripped, data integrity all the way.

On the machine side, unless your data store is independant (and hence the server had a mirrored OS) then your are better off to keep spares for the server since it will take as long to swap a part as it would to switch over to a separate machine (by the time you have transferred disks etc).
 
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