Sequential write speed dropped 200MB/s raid array?

tommytinkle

tommytinkle

tommytinkle

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Hey,

Since using my raid array, the sequential write speed has dropped a hell of a lot. Is this due to fragmentation or some other problem that I can fix? When they were empty they were pulling 287MB/s and are now down to less than one hundred?

Thanks for any help :)
 
If the outer sectors of the disks are now occupied, perhaps CrystalDiskMark is writing to the slower inner sectors where it can find sufficient free space? It could maintain the original results by overwriting your own data, but presumably you'd be even less happy with that outcome.

Have the read speeds dropped off at all?
 
Hey,

Read speeds have dropped 20mb/s over the blank disk benchmark, certainly not 200+ as the write speeds have! Volume is 8% fragmented but would that cause that serious a drop?

Thanks for your help
 
Well, yes, fragmentation might affect write benchmarks, but to what degree depends on a whole load of factors - how much contiguous free space is available, where it's physically situated on the disk(s), and how the benchmark utility makes use of it. Even then, the lower benchmark figures might not necessarily correlate to a drop in real-world performance.

I'm a bit surprised that your read speeds have also fallen a bit, but without knowing the internal workings of the benchmark app, and how it runs its tests, it's hard to say if that's significant.

I suppose the obvious suggestion is to try defragging, maybe using an app (eg MyDefrag) which will allow you to put large or lesser used files at the end of the disks, freeing up space on the outer sectors.

To be honest though, I wouldn't worry about it too much unless you've actually noticed a performance hit when using the PC normally.
 
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