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03-27-2008 10:25 AM
03-27-2008 10:25 AM
I heard that "SAS is a dual-port interface that provides two separate data paths into the drive." But then, what is SP and DP???
Solved! Go to Solution.
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03-27-2008 10:33 AM
03-27-2008 10:33 AM
Re: Difference between single and dual ports/SAS
there are two types of SAS disks: Disks with one port, and disks with two ports. Those with one port are single port, with two ports are dualported. To use DP disks you need a proper enclosure and HBA for it, like an MSA70 and SC44Ge. DP is only supported with HP-UX and OpenVMS. If you're running Linux, Windows, Netware or anything else then HP-UX or OpenVMS, you can buy single port disks.
The second port used for redundandy, so that a disk is still available after a path or controller failure.
Best regards,
Patrick
Patrick
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03-27-2008 11:03 AM
03-27-2008 11:03 AM
Re: Difference between single and dual ports/SAS
Now that's a real bummer! Here I was thinking it had something to do with speed!!!
But if DP is only supported on OpenVMS and HP-UX, why does HP offer both SP and DP drives for the ProLiant servers which support neither of these OSs...
Please do enlighten me.
Is the second port for redundancy alone?
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03-27-2008 11:12 AM - last edited 2 weeks ago by Parvez_AL
03-27-2008 11:12 AM - last edited 2 weeks ago by Parvez_AL
SolutionHello,
the second port won't be used in a ProLiant, only in MSA60 and MSA70 Enclosures with the right HBAs. There are AFAIK some Integrity servers which also support DP drives.
Take a look at this thread:http://forums12.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1206645013954+28353475&threadId=1210934
[The above link is no longer valid]
And the MSA70 QS:
https://h20195.www2.hpe.com/v2/gethtml.aspx?docname=c04140655
Best regards,
Patrick
Patrick
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03-27-2008 11:35 AM
03-27-2008 11:35 AM
Re: Difference between single and dual ports/SAS
That explains a lot!
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03-27-2008 11:38 AM - last edited 2 weeks ago by Parvez_AL
03-27-2008 11:38 AM - last edited 2 weeks ago by Parvez_AL
Re: Difference between single and dual ports/SAS
Hi Prasanna,
SAS is a point-to-point serial architecture that is far simpler than its parallel predecessor SCSI,
yet offers significantly higher throughput (3Gb/sec) as well as better scalability.
Please see the following link:-http://forums12.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1206644034961+28353475&threadId=1210934
[The above link is no longer valid]
Hope fully above link full fell your requirements.
Thanks--Yaqub
HP Support!!!
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02-27-2018 10:57 PM
02-27-2018 10:57 PM
Re: Difference between single and dual ports/SAS
How can differentiate/identify between Dual port and single port via command line? In other words, how can i identify the disk is dual port or not via command line?
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