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RvR (Raptor vs RAID)


why would you buy a 150GB raptor for 225 when you could buy 2 320GB drives and a RAID1 card for less than 225. Putting the 320 GB drives in RAID1 gives you 14k read time vs 10k read time of the Raptor. And you get it backed up right away too in RAID 1, and double the space!



so why would someone go Raptor over RAID1?

    
joeswm8

You cant just double the RPMs for the drives... and you dont even need to buy a RAID card if you have a motherboard newer than like 2004.

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Burgerbob

Because it doesn't work like that

Putting two 320GB harddrives in RAID0 (I think you got your RAIDs mixed up, RAID1 is when you have 2 mirrored harddrives) would give you at maximum double the performance of one 320GB harddrive (though it almost never reaches maximum potential).

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diduknowthat

from RAID 101:


Quote:







RAID1 - Mirroring

RAID1 is an implemention of drive mirroring, for every pair of drives (because RAID1 is done in pairs), the contents of DriveA is mirrored in real-time to DriveB

The advantage of RAID1 is that there is a very solid 1-level of Fault Tolerance (i.e., one drive can completely fail without any loss of data); the downside is that it is not very space efficient (drive capacity of a two-drive pair will be the size of the smaller of the two)

Since data is stored across both drives, read-performance will be (theoretically) twice that of the individual drive; write performance will be that of the slowest drive.

A minimum of two drives is required

it says the read time is double...

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joeswm8

It will be (theoretically) doubled. But so is the same as SLI and crossfire, and it never comes close to doubling. Plus, RAID 1 is for safety as one drive can fail and you won't lose data. RAID 0 is more for performance gain.

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diduknowthat

thats because raid1 the data are written on both drives so it takes longer and more cpu power.

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kof2000

It does not take longer to write the data in RAID1, it takes the same amount of time. (roughly)

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Bobo


Quote:








Originally Posted by joeswm8
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why would you buy a 150GB raptor for 225 when you could buy 2 320GB drives and a RAID1 card for less than 225. Putting the 320 GB drives in RAID1 gives you 14k read time vs 10k read time of the Raptor. And you get it backed up right away too in RAID 1, and double the space!



so why would someone go Raptor over RAID1?

Wow... RAID1 is worse performance wise then a single drive, because it has to copy the date to both drives. What your thinking of is RAID0, where it splits the data up between the drives.



And as others have said, you dont double the speed, it's still at 7,200RPM's. All that gets raised is the transfer rates.



The raptors are better then a RAID0 array because it can access files much quicker (~2ms vs ~8ms), and has a higher transfer rate then a single 7200RPM drive.

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[-0MEGA-]

but RAID 101 said that read time is doubled... so why isnt this true?

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joeswm8


Quote:








Originally Posted by joeswm8
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but RAID 101 said that read time is doubled... so why isnt this true?

Are you talking about RAID1 or RAID0?

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[-0MEGA-]
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