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  #21 (permalink)  
Old 6th June, 2005, 09:30 PM
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Originally Posted by gedon
what i know about raid 5 is that all drives should have the same size and one of your 3 or 8 or 12 disk can fail without loosing data.

i'm still searching for some benchmarks with a raid0 and a raid5(4HDDs) setup

i'm not shure if i upgrade my sys or not. what i see is that speed goes down when 3 or more read/write accesses running.

has raid 5(4hdd@pci) a constant datarate?
RAID0 is flat-out the fastest RAID you can run. It is also not truly a RAID at all, because it isn't redundant. If you lose a single drive in RAID0, you are done, and all your data are gone.

RAID1 is pretty fast on reads (near RAID0), but slower on writes. This is because the reads can be staggered between the two drives, but all the data have to be written to both drives. It is also extremely reliable, because all of your data are fully duplicated between both drives. Lose one drive, no biggy. You can even pull a drive from a RAID1 and use that drive to boot another machine with an exact image of the first machine. Hence the term 'mirror'.

RAID5 varies in performance with the number of drives involved. As you increase the number of drives, your read performance improves because you can stage your data seeks across multiple drives. This is most visible with large data transfers. Write performance works the same way. So, you can go from performance that is somewhat worse than RAID1 on writes and slightly worse than RAID0 on reads, to performance that rivals RAID0 on both reads and writes, plus has a level of fault tolerance (RAID 5 sacrifices one drive for redundancy, no matter how many drives are in the array). It all depends on what you are willing to invest.

There are also combinations of the above, such as RAID01, RAID10, RAID50, and RAID51. These all make various tradeoffs in terms of cost, performance, and reliability.
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  #22 (permalink)  
Old 7th June, 2005, 05:29 PM
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I can say from experience (a bad one) don't use software RAID. Hardware raid is the only way to go if you actually care about the data. If you just want fast game performance go with a stripe mobo setup it will be fast and cheaper. But if you have important data get a controller card and a 5 or a 0+1 setup.
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  #23 (permalink)  
Old 8th June, 2005, 11:06 PM
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Oddly enough, in the world of Solaris and Sun servers, software RAID is pretty normal. Two of the most flexable volume managers on Solaris are software RAID.
Any views, thoughts and opinions are entirely my own. They don't necessarily represent those of my employer (BlackBerry).
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