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questiob about raid 5

post #1 of 9
Thread Starter 
ok i was wondering if i have 2 750gb hard drives...would i have to have a drive the same size as the other 2 or can i get one smaller? and would i get a faster read performace or would i have to do a 0+1 raid for that to work?
 
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post #2 of 9
Has to be same size. Read performance will improve indeed, but write performance will drop, well, dramatically (although with the current southbridges it isn't as bad as it used to be).

With onboard, I'd prefer 0+1, even though you'll need yet another drive for that. For 5, I'd get REAL hardware RAID (i.e. a dedicated controller).
    
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post #3 of 9
Thread Starter 
the how well would this work then http://www.newegg.com/Product/Produc...82E16816115028 since the best i could put it in is a 4x pci express slot using raid 5

crap never mind its SAS....i need one with at least 4 or more SATA2 connectors
 
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post #4 of 9
Quote:
Originally Posted by terraprime View Post
ok i was wondering if i have 2 750gb hard drives...would i have to have a drive the same size as the other 2 or can i get one smaller? and would i get a faster read performace or would i have to do a 0+1 raid for that to work?
Short Answer: Yes, Yes.
Long Answer: RAID requires identically sized drives for any one array, and you prefer to match the drives as much as possible. All RAID modes will give increased read performance, but increased read performance from RAID 1 has to be supported by the processor and operating system. Any array that features striping will also increase write performance. The only standard RAID mode that does not feature any striping is RAID 1.
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post #5 of 9
Thread Starter 
adaptec or highpoint for a raid controller?
 
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post #6 of 9
Quote:
Originally Posted by EmerilLIVE View Post
Short Answer: Yes, Yes.
Long Answer: RAID requires identically sized drives for any one array, and you prefer to match the drives as much as possible. All RAID modes will give increased read performance, but increased read performance from RAID 1 has to be supported by the processor and operating system. Any array that features striping will also increase write performance. The only standard RAID mode that does not feature any striping is RAID 1.
Each drive in an array will size to the smallest drive. You can run different drives in some cases, but it's advised to run identical drives.
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by EmerilLIVE View Post
Short Answer: Yes, Yes.
Long Answer: RAID requires identically sized drives for any one array, and you prefer to match the drives as much as possible. All RAID modes will give increased read performance, but increased read performance from RAID 1 has to be supported by the processor and operating system. Any array that features striping will also increase write performance. The only standard RAID mode that does not feature any striping is RAID 1.
oh and about the faster reading...talking about faster like mirroring does? unlike stripping?
 
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post #8 of 9
You can get smaller drives, but just know that the other drives will effectively be the size of the smallest drive. So, if you get a 500GB drive, all of the other drives will "act" like 500GB drives which would leave you with a RAID5 array of 1TB (unformatted).

I would stick with the same size AND model drive.

I like adaptec for raid controllers.
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post #9 of 9
BTW, you can put SATA drives on a SAS controller, but not the other way around.
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