RAID 5 or RAID 0+1?

M

mista ting

Gawd
Joined
Apr 13, 2006
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which is better? im thinking to have 2x640AALS in raid 0 for windows / apps / games and 2x640AALS in raid 1 for back up / redundancy is this the best option?


or maybe 150GB velociraptor for windows and 2x AALS in RAID 1?
 
or all 4 in RAID 10...

It really depends on what you are trying to accomplish.. RAID 5 is slower, but you get more usable space..
 
There's no raid level can can sufficiently be called a "back up." It's not a back up, which is (at the very basic meaning) a second copy. RAID (in anything but 0) only allows you sustain one or more physical drive failures (or more precisely, bit errors) and still have your data (hopefully, unless your RAID level doesn't support multiple drive failures/bit errors, and that actually happens).

Also, it's hard to make a recommendation on your needs when we don't know the intended usage. RAID-5 can be fast, but most people (myself included) run it on an onboard controller that is basically software RAID (parity calculations done by the CPU), and they perform pretty bad (but well enough for my purposes). The drives you have chosen are fine, and you've given us some information, but not the most important part - what are you trying to achieve. It could be that no RAID is better for you than it would be to use RAID.

More info, please.
 
This is a bit misleading.... and gets into "archive" versus "back-up" versus "mirror" versus "redundancy". RAID 1 or other permutations that involve drive mirroring certainly qualify as redundancy, if not a (loosely defined form of) backup. True, if a virus jumps on your drive, then mirroring will efficiently infect your "backup". But for protection against single-drive failure, mirroring is arguably the most effortless "backup" there is, no?
 
no a because all redundancy protects is from a bit error...aka single drive failure
if anything else happens your screwed.
If you want backup make a true backup
 
http://www.synology.com/wiki/index.php/RAID_vs_Backup

"RAID: This is not a backup system; this cannot emphasize this enough. RAID is designed to protect the user against hardware failure of the HDD, and allow the merging of HDDs into one larger volume. However, placing all of the data onto one volume does not constitute it being "backed upped" because there is only one copy of the data, and it's in one location."

"a backup is defined as: In information technology, backup refers to making copies of data so that these additional copies may be used to restore the original after a data loss event and restore small numbers of files after they have been accidentally deleted or corrupted"
 
RAID [helps] protect against hardware failure
Backup [helps] protect users from themselves

Neither are perfect, if you care about your data, create copy (that is isolated!). As for RAID levels raid 0 gives you more space and (normally) faster performance, raid 1 is more reliable, raid 5/ 10 a bit of both. But don't overlook regular back ups and a fireproof safe.
 
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