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Old 03-03-2004, 03:55 PM   #1
ziz
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Registered: Nov 2003
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Question Is raid safe ?


HI..

I got a Slack 9.1 server running on the 2.6.4-rc1 kernel with the this specs

P4 2,4 GHZ HT
256 Ram DDR400
4 X 120 GB SEAGATE SATA DRIVES
GIGABYTE 8KNXP MBOARD
ICH5 SATA CONTROLER (2 PROTS)
SILCON IMAGE 3112A SATA (2 PORTS)
INTEL 1000 CT GIGABIT with SCA PCI bypass



The thing is that the 4 harddrive partions is driveing me nuts. What i need is one big partion 480 GB . As I understand i can use Raid 0 or Raid 5 or just make one big partion with the 4 drives together.

The raid 0 solution sounds really intresting as i get more speed out of the array but that doesnt really matter as the drives make 50 MB/s alone and that their is no other computer on the network that is faster. So for me their is no reason to take the risk in building a raid 0 array.

To apend all disk drives together would be a good choice, as i will lose the same amount of data as in the stand alone solution if one drive fails, the only problem is that i will be hard reorganize the data from the other 3 disks in the case of a failure.

So then i have Raid 5 left..So by giving up one drive i get the best safety of all 3 solutions. But my question is will i have to make other tradeoffs for speed etc.. ?

And one more thing.. Sometimes (very seldome)i have a powerfailure and then the server goes down. With ReiserFS as partion type and the fact that the server is used only for short intensive burst, this has never been a problem...the server just boots up again.)

If i would construct a raid 5 aray how will it handel the power failure?
Im afraid that it could be corupted if that would happen and that my chanses are better with the stand alone system..

Sorry for my poor english !

Patrick
 
Old 03-04-2004, 03:32 AM   #2
louishp
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Registered: Mar 2004
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If your getting frequent power failures and your saying this is a server I would first recommend buying a UPS, raid is really upto you.

Would you be using software or hardware raid?

I would recommend if your data is valuable and this is a 'server' just stick with mirroring the drives although i think you can only have one hw mirror on most motherboards also from my experience (or lack of), combining the drives can get extremely tricky.

But definately UPS the sucker or you could loose everything.
 
Old 03-04-2004, 06:05 AM   #3
TheBlackUnicorn
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Distribution: Debian and Gentoo
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Raid 0 should indeed give you the most speed (although bus speeds will probably be a limiting factor there). However, if one of your Raid 0 drives should crash, you lose everything. It's a rather big risk, I'd say.

Raid 5 would also be very fast and would give you an added security layer (you can replace a single broken drive without data being lost). The downside is that you would lose 120 GB of space to the mirroring function.
The results of a power failure would not be any worse than with a separate drive setup afaik.

Appending all the drives could be ok too, but you would not gain anything except the single partition. And I don't know what would happen to your data if one disk fails.

Raid5 seems the way to go to me, if you can afford to lose the space
 
  


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