JBOD / Raid0

>:|sh4d0w|:<

>:|sh4d0w|:<

>:|sh4d0w|:<

Soldato
Joined
21 Feb 2004
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2,842
Hi, im planning to order 2 500gb drives for storage only, with occasional access to the files, certainly not daily access, thus performance is not critical. What is however, is that I want them to appear as 1 single large drive of 1000gb (930gb actual). Im am planning to store all my video editing projects on there, so high fault tolerance/ reliability of the system would be desired. Should i choose JBOD or RAID0 in that case. Both my sata ports are full, thus i have 2 spair raid slots on the mobo, so if i went with JBOD id have to buy a PCI Sata Card which i dont mind doing if JBOD will be more reliable. So which should i choose?

Thanks :)
 
RAID-0 : fastest : if one drive dies, you have lost all data.

JBOD : as fast as one drive : if one drive dies, you have some chance of a painful recovery process via special tools succeeding in rescuing *some* data.

Why don't you forget those, and just put a seperate filesystem on each drive? Is it absolutely essential that your data is organised on one filesystem?

If you use a modern _decent_ OS, try RAIF.

http://en.wikipedia.org/wiki/RAIF
 
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>:|sh4d0w|:< said:
....planning to store all my video editing projects........high fault tolerance/ reliability....
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RAID1. You would have to be mental to store either just one copy on one disk or, worse, RAID0!

What happens when (not if - when) the disk/s die? Bye bye to an awful lot of work. Storage is cheap :)
 
^ So by RAIDing two discs (aside from raid5 etc) actually increase the risk of failure? I may end up going for just one 500gb drive and picking up a 1tb+ drive 12months+ up the line. I have a Asus P4C800E Deluxe, the raid ports cant be used for non raid discs right? And if i buy a Sata Raid PCI card, can i just plug a single disc in there, even though its a raid card.
 
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>:|sh4d0w|:< said:
^ So by RAIDing two discs (aside from raid5 etc) actually increase the risk of failure? I may end up going for just one 500gb drive and picking up a 1tb+ drive 12months+ up the line. I have a Asus P4C800E Deluxe, the raid ports cant be used for non raid discs right? And if i buy a Sata Raid PCI card, can i just plug a single disc in there, even though its a raid card.
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Depends how valuable your work is I suppose. Myself, I have a storage drive and external backup drive - but I suppose keeping 500Gb in sync over USB2 wouldn't be much fun :D

RAID1 copies data to both drives in the array, so if one fails you still have a full copy.

RAID0 splits data over the drives in the array so if you have two drives and one fails, half of every file disappears. Which means complete data loss - not good! :)
 
rpstewart said:
You can run the Silicon Image RAID ports in non RAID mode quite happily on the P4C800E, I did exactly that when I was running with that board.
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Thanks for that info matey, i was always told it was raid only, youve just saved me £20 :) Any change of settings etc needed to use them>
 
matja said:
Not the risk of failure, but the risk of data loss in event of failure ;)
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Actually it does increase the risk of failure. e.g. one disk has MTBF of 50,000 hours. 2 disks have MTBF of 25,000 hours. Because the M of MTBF is "Mean" then the more disks you have, the more likely a failure is. That's the whole point of RAID which was to use resilience to make up for the increased likelihood of failure over a SLED.

RAID 0 and JBOD are simply not worth doing for anything other than temporary storage of non-critical data. If you must have 1TB filesystem buy a 1TB drive.
 
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