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Simple SAS Card/Cable Question

post #1 of 16
Thread Starter 
On 6Gb SAS cards, what does the 6Gb denote? Is that the speed it can deliver per each connection?

For instance if I have a 6Gb SAS card hooked up with one cable to a SAS extender, which connects to 10 drives, do the 10 drives have to share the 6Gb/s lane?

Thanks,

-Sawx
Edited by redsox83381 - 4/1/14 at 7:20am
    
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post #2 of 16
Thread Starter 
Bump, help! I called LSI and they said 6Gb is not the speed of the cable but I don't believe them!
    
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post #3 of 16
Its the max speed of the SATA 3 interface.
post #4 of 16
6gbps is the spec for the port the drive is attached to.

the cable has zero to do with that. copper=copper.
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post #5 of 16
Thread Starter 
Thanks. Doesn't there have to be a max speed of the cable though?




Edit: Maybe I can rephrase, what is the max speed of a connection between a SAS Expander and a "6Gb" SAS card? Is it 6Gb/s?
Edited by redsox83381 - 4/1/14 at 8:40am
    
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post #6 of 16
Technically if you had some compete piece of junk cable perhaps it could cause signals to be degraded. But any reasonable cable you would get with the card or aftermarket will be certified and not a significant barrier. However as you asked what the 6Gb means, it is as myself and the other poster said the max transfer rate of the device connected.
post #7 of 16
Thread Starter 
Thank you. So what you're saying is that 10 SAS Drives connected through that one SAS cable can all theoretically transfer at 6Gb/s simultaneously? (Assume the drives are capable of that speed).
    
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post #8 of 16
Yes its the max speed at the terminal connection in their advertising. But to be honest there are many, many other things that would prevent you from actually getting that much bandwidth out of all of them, even if the cable and host controller actually could process that much data - the cable is the least of them redface.gif
post #9 of 16
Quote:
Originally Posted by redsox83381 View Post

Thank you. So what you're saying is that 10 SAS Drives connected through that one SAS cable can all theoretically transfer at 6Gb/s simultaneously? (Assume the drives are capable of that speed).

on my storage server i get 1Gb reads and writes with 12 seagate st2000dm001 drives in RAID 6 with an LSI 9260-4i through an intel res2sv240 expander.

by the time you saturate the sas link which is theoretically 24gbps 4x6gbps, you will have been bottle necked by the pci express slot.
Edited by Master__Shake - 4/1/14 at 11:15am
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post #10 of 16
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

on my storage server i get 1Gb reads and writes with 12 seagate st2000dm001 drives in RAID 6 with an LSI 9260-4i through an intel res2sv240 expander.

by the time you saturate the sas link which is theoretically 24gbps 4x6gbps, you will have been bottle necked by the pci express slot.

Ok. Can you tell me more about your setup? Is it a NAS/File Server? Did you do 10 + 2 parity drives? Or (4 +2) (4+2) ?
    
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