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PCI-X speed question


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Hi,

 

I'm hoping that someone with a bit more tech knowledge can help me out with a question...

 

I've got a Tyan Thunder K8SR http://www.tyan.com/archive/products/html/thunderk8sr.html motheboard and I'm about to upgrade to new(er) SATA cards because the 3ware 9500s card I have is a bit flakey and doesn't play nicely with spinup/down and SMART commands.

 

I've got 2 x SuperMicro AOC-SAT2-MV8 PCI-X http://www.supermicro.nl/products/accessories/addon/AOC-SAT2-MV8.cfm cards arriving shortly. They are 8-port SATA cards, but I'm only going to be running 8 drives initially.

 

The motherboard has 2 independent PCI-X channels (one slot each). One that can run at 133Mhz and one that can run at 100MHz.

 

So, my question is, should I run 8 drives off one card on the 133Mhz slot, or split across both slots and run 4 drives on each? What are the performance bottlenecks likely to be?

 

Thanks in advance!

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Hi,

 

I'm hoping that someone with a bit more tech knowledge can help me out with a question...

 

I've got a Tyan Thunder K8SR http://www.tyan.com/archive/products/html/thunderk8sr.html motheboard and I'm about to upgrade to new(er) SATA cards because the 3ware 9500s card I have is a bit flakey and doesn't play nicely with spinup/down and SMART commands.

 

I've got 2 x SuperMicro AOC-SAT2-MV8 PCI-X http://www.supermicro.nl/products/accessories/addon/AOC-SAT2-MV8.cfm cards arriving shortly. They are 8-port SATA cards, but I'm only going to be running 8 drives initially.

 

The motherboard has 2 independent PCI-X channels (one slot each). One that can run at 133Mhz and one that can run at 100MHz.

 

So, my question is, should I run 8 drives off one card on the 133Mhz slot, or split across both slots and run 4 drives on each? What are the performance bottlenecks likely to be?

 

Thanks in advance!

 

4 and 4 would probably be a little faster but I am not sure if you will notice all that much different with either configuration.  If it were me I would just attach all drives to one card and be done with it.

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I have two of those cards plugged into a Supermicro X7SBE which also has a 133 and 100 slot. It depends on the speed of your drives, but with 2T green drives I could put 7 drives on the 133 slot card with no speed degradation (tested during parity rebuild). Using the 100 slot I could put 5 drives. All tests were performed with 16 2T drives. I was balancing the drives between the six onboard SATA ports, the two PCIX cards and one SASLP in a PCIe slot. In my testing both SAS2 cards had more bandwidth than the SASLP.

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