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New drive slower than expected

thebluevoice
in General Support (V5 and Older)

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Hi All,

 

Originally I've had 3x 2tb wd greens in my unraid box..

 

Speeds for parity check were around 70+ MB/s

 

I just changed over to 1x 2tb wd green + 2x Toshiba DT01ACA 3tb drives by

 

Changing the parity drive

Then changing out one of the wd data drives (after the parity rebuild etc) with data rebuild etc.

 

I noticed straight away that the speeds seemed a lot slower than before.

 

parity rebuild was now low teens - 70MB/S - mostly around 30 ish.

 

copying data off gigabit is giving strange results too.

 

copying via disk shares (disk1 and disk2) I find the wd green a bit quicker than the Toshiba

 

Using the hdparm -tT the wd green is a little bit quicker than the 2 Toshibas.

 

I would have thought the new drives having the faster rpm 7200 v 5440 for the greens would be faster?

 

My box is a HP N40L which is only sata II - could it be the tosh drives would prefer Sata III ?

 

Any ideas?

 

Thanks!

 

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