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Raid 5?

post #1 of 7
Thread Starter 
I was reading up on it, but what is it? I know you need 3 drives, but how is it different then RAID 0?

Also I am getting 2 seagate 7200.10 drives, cause I use my other WD sata drive in the RAID 5? They are all of the same storage size, but I know the seagates are alot faster, 16mb cache and perp and what not.
    
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post #2 of 7
RAID-0 is striped data across multiple drives, bumping up the sustained transfer rate performance. Only problem is, if you lose one drive (hardware failure) you lose all your data because every drive is needed to read what you had written.

RAID-5 is striped data across multiple drives, but parity information is also generated that takes up the equivalent of one drive. This allows you to recover data if any one of the drives in your array fail. You could do RAID-5 with 2 drives but its really only worth considering for 3 drives and above (RAID-1 would be what you would choose for 2 drives). No matter how many you add, you'll always lose just that 1 drive worth of storage to parity, so RAID-5 sounds more attractive as you add more drives.

You should really search on google for this topic. There must be 100,000 articles explaining what RAID is.
     
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post #3 of 7
Basically, RAID5 gives you a performance boost but not as good as RAID0. This is due to overhead for the parity calculations. It is not as good as RAID1 since RAID1 is easily recoverable. RAID5 takes some work to restore data. It is better than RAID 0+1 or 10 since it can use less drives. Up to you to balance your needs.

With your configuration, I definitely would NOT do RAID5. The WD HD would only slow the 7200.10s performance.
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post #4 of 7
Thread Starter 
K thanks guys, I am just gonna use RAID 0 and either manually or through software back up all my important files to the spare 250gb drive. Figure I don't need a back up of everything. Just documents, music, movies, photos and what not. Games and most software can be installed back in if it fails.

Seems like the best thing to do.
    
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post #5 of 7
Quote:
Originally Posted by atomicfission92 View Post
K thanks guys, I am just gonna use RAID 0 and either manually or through software back up all my important files to the spare 250gb drive. Figure I don't need a back up of everything. Just documents, music, movies, photos and what not. Games and most software can be installed back in if it fails.

Seems like the best thing to do.
Agreed... or you can get two more 7200.10s and got RAID 0+1!
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post #6 of 7
RAID5 is intended for Fault Tolerance where you can lose a drive and not have downtime, especially it if it a Hot swap drive, like a SCSI U320 drive.

It is much slower than RAID0, but the tradeoff is no data protection whatsoever on RAID0

Mostly see RAID5 on Real Servers, that cant afford to go down with a abd drive.

At work, I run split raids on my servers, RAID1 (Mirror) for the OS, usually 2 73GB Drives so I can frag the OS, and rebuild it without downtime, and the Data drives are RAID5, usually 3 or 4 drives for the redundant nature of RAID5.

I have one RAID10 Setup.. two sets of 7 drives each at RAID0, and RAID 1 over them both. Total of 14 drives,w ith a 15th for a hot swap spare. Fit nicely into a 15 drive SAN Enclosure that way. Speed is good over 4GB fiber too
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Agreed... or you can get two more 7200.10s and got RAID 0+1!

well that would be like 320 bucks. I am barely affording the 2 drivers for $160 lol
    
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