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Limiting factor in RAID0?

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March 4, 2012 11:31:03 PM

What if I have a drive that should write at 300mb/s and 500mb/s. If in RAID0 should they run more like 600mb/s (where the 300mb/s is a limiting factor) or will it be more like 800mb/s?

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a c 539 G Storage
March 5, 2012 1:35:18 AM

The Read/Write performance of a RAID-0 array is based upon the drive with the slowest Read/Write speeds; so if you RAID-0 a 300MB/s drive and a 500MB/s drive your speeds would max out at 600MB/s.

The capacity of a RAID-0 array is also based upon the drive with the smallest capacity.
If your RAID-0 a 60GB drive and a 240GB drive, the total capacity of your array will be 120GB (60GB x 2).
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a c 304 G Storage
March 5, 2012 12:05:21 PM

The limiting factor in RAID0 is that it is a ticking timebomb waiting to destroy your data. Back up frequently.
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a c 539 G Storage
March 5, 2012 2:08:41 PM

:D 
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a b G Storage
March 5, 2012 3:24:39 PM

RAID0 using two different drives is a very bad scenario. You will always have the worst performance between the two of them, times two.
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a c 353 G Storage
March 5, 2012 4:51:47 PM

^ Not true
Concur with WyomingKnott, I do not recommend raid0 SSDs used as a Boot + program drive. You chouice if used as a Data drive.

To answer your question on speed. For sequencial read/writes. Over all will depend on (a) strip size and (B) the size of files being called. For example using a 64 K strip. If the file size is less than 64 K then all of the file will be on one drive and the speed will be dictated by that drive. If the file is split (<64 K) then the speed will be dependent on both drives, part of the file would be at drive 1 speed and part of the drive would be at drive 2 speed and will be somewares between the sum of the two but less than 2 x the fastes drive.

Raid0
.. Improves Sequencial performans, the LEAST important matrix for an OS + Program drive. Important for a data drive when working with LARGE file structures.
.. Does NOT improve access time
.. Very litel improvement for the more important 4 K random read/writes.
Improves sequencial speeds
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