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2 simple RAID questions

R

rjcoolpix880

Member
I read the Anandtech articles on raid and understand how it works. but here are my questions:

  1. 1: do you have to have 2 identical drives at least in size, or does speed and seek tome matter also for it to be succesful?
  1. 2: if i set up a raid 0 array (2 drives with identical contents) doesn't the redundancy only protect againts physical errors? I mean how often does a drive physically fail? So whats the point, is it worth it?
 
You can have drives of differing speeds and sizes but it will only use as much as the smaller drive, IE you have a 20 and 60 gig drive, it will only use 20 gigs of your 60 gig drive.
2. RAID 0 is striping without any fault tolerance. the data is broken down into blocks and each block is written to a separate disk drive.

Basically if 1 drive chokes, you loose all of your data, but it's a nice speed increase 😀
Check This out for a nice explanation.
 
When you have questions have a look at the FAQ section first. If the answer isn't there do a little search to see if anybody else has asked your questions. When you have done both and you still need help, then you are ready to post a new message. 🙂

What the FAQs have to say about RAID
 
If you don't want to spend more time than necessary restoring your stripe(s) and data, be sure you are using ECC RAM and that your chipset supports it (not all chipsets do - more Intel and VIA supp. ECC than others) (esp. if running RAID-0 only). Running RAID-0 w/o a current backup is like flying an experimental airplane w/o a parachute.
.bh.
😎
 
1) No, you can (try) to raid any two drives. If they are not the same size you will loose diskspace (except for SW-raid, I think). If they are not identical you might not get the expected performance (even if access times are the same, every drive has its own caching and read ahead strategies).

2) As you said, mirroring (you mean raid1 or 1+0) will protect your data only from a physical failure of one drive. If 24/7 operation is essential to your work then you will want this. It does not protect against manual deletions or viruses and does not replace a weekly backup.

 
MrGrim, i allready did that and they didnt have anything, oh and i meant raid-1 sorry. Thanks woolmilk that was exactly what i was looking for. So for my personal use its pretty stupid(well, not wirth the price) to go raid. I just wanted to back up digital photos and artwork i make on the computer.
 
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