What WAS my bottleneck?


NLS

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So my server was roughly this:

- i7 4771

- 24GB DDR3 RAM

- 2x SAS 2008 controllers that had 12 SATA disks (11 data + parity)

- SSD cache on on-board SATA

 

And I changed it to:

- R5 5600G

- 32GB DDR4 RAM

- Same 2x SAS 2008 controllers (that now hold only the 11 data disks)

- Parity on-board SATA (I don't know why it came to me to do it like that... thinking maybe the SAS controllers to be in READ mode and the onboard in WRITE? Used to be an issue back in IDE days)

- Cache on M.2 NVMe

Thing is, with the old system parity was verified (every 15 days or something) with less than 60MB/s! (Which I remember distinctly being 2 or 3 times that when my disks were much less)...

New system seems to check parity roughly DOUBLE the speed of the old system (>100MB/s) - although I will know exactly when it finishes.

...what was the main bottleneck of the old system?
CPU? The change of bus of parity disk? Faster RAM?
Possibly a bit faster/newer PCIe protocol for the SAS2008 cards?

I know the easy answer is "all of these", but really someone maybe that knows the inner mechanics of the system... what affected it more?

 

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Id probably agree its a little bit of everything you did to improve your system. 

My i7 4790k was getting

85Mbs when I was using Western Digital Green 2TB drives at 5400RPM

125Mbs Now I'm running 4TB Iron Wolf drives at 5900RPM

 

Are you running Parity every 2weeks? I honestly think 1x a month is good since it doesn't trash on your drives as often and gets the same results in the end. 

 

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7 minutes ago, kizer said:

Id probably agree its a little bit of everything you did to improve your system. 

My i7 4790k was getting

85Mbs when I was using Western Digital Green 2TB drives at 5400RPM

125Mbs Now I'm running 4TB Iron Wolf drives at 5900RPM

 

Are you running Parity every 2weeks? I honestly think 1x a month is good since it doesn't trash on your drives as often and gets the same results in the end. 

 

 

You are right, I check parity once per month, after all.

 

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