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Can HBA cards be root cause of system bottleneck?

post #1 of 9
Thread Starter 
My mobo, HDDs, and even SATA cables support 6Gb/s. I want to know if my HBA cards (SUPERMICRO AOC-SASLP-MV8 with transfer rate up to 3Gb/s) cause my system slow down in reading/ writing data?
Thank you.
post #2 of 9
Probably not. No. That is a good card. Only cheap PCI cards or PCI x1 cards have bottlnecks (because the slots do)

I think you card is x4 speeds so it's unlikely a bottleneck for you.


Someone might be able to put math to it but generally a HDD only reads up to 200MB/sec (3TB SEAGATES)

(I'm too lazy to look up x1, x4 speeds etc and do the math. Sorry)
post #3 of 9
It's certainly technically possible. We need a lot more details on your issue to give a better answer than that.
post #4 of 9
Quote:
Originally Posted by Elpee View Post

My mobo, HDDs, and even SATA cables support 6Gb/s. I want to know if my HBA cards (SUPERMICRO AOC-SASLP-MV8 with transfer rate up to 3Gb/s) cause my system slow down in reading/ writing data?
Thank you.


When you say slow down- what do you mean?

Have you tested it?

What speeds do you see?
What kind of Hard drives?
post #5 of 9
Thread Starter 
Mobo Asus P8Z77 -V
2x4GB Corsair DDR3 memory
Supermicro AOC-SASLP-MV8 card.
Seagate Barracuda XT 7200 RPM 6Gb/s 4TB and 3TB drives.
UnRaid parity check so slow and lasted over one day. Still running when I cancelled it.
My question here is if I replace Supermicro AOC-SASLP-MV8 card by a IMB M1015 card that supports up to 6Gb/s (or ~600MB/s), writing/reading speed will be improved? I don't think PCIe x1 or x4 does matter in this case. I don't know...
post #6 of 9
It is highly unlikely that you will see any significant improvement by replacing the card. Your bottleneck is the mechanical drives. Even with 6Gbps 3/4TB drives your max read/write real world performance on each drive is going to be 150MB/s which is only about 1.2Gbps. With parity checks, you will also be limited by the IOPS of the mechanical drives (which will also not be improved by replacing the card).
post #7 of 9
I run 8 Seagate 3TBs off my IBM card without issues.

I don't think the HBA is a big concern unless its a crappy one. Any x8 slot card is certainly fine.
post #8 of 9
Thread Starter 
Quote:
Originally Posted by vladd View Post

It is highly unlikely that you will see any significant improvement by replacing the card. Your bottleneck is the mechanical drives. Even with 6Gbps 3/4TB drives your max read/write real world performance on each drive is going to be 150MB/s which is only about 1.2Gbps. With parity checks, you will also be limited by the IOPS of the mechanical drives (which will also not be improved by replacing the card).
Thank you very much. You saved me a lot of money to buy new IBM cards.
post #9 of 9
If you want to remove the bottle neck the biggest thing you can do is get faster hard drives
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