[OmniOS-discuss] FW: Fibre Channel performance on OmniOS

[Kyle Bruene]

Thanks for the responses. I guess I forgot to mention that I have dual port and some quad port cards in the hosts. I am starting to wish I would have just spent some extra and gotten 8gb instead. I feel like most of the access is going to be single application/stream since it is mostly Exchange 2010 accessing the SAN from inside a VM. From what I understand it has been redesigned to be more sequential, combining IO requests. Thanks for your help everyone. I think I've got it figured out now.

-----Original Message-----
From: Johan Kragsterman [mailto:johan.kragsterman at capvert.se] 
Sent: Wednesday, August 20, 2014 10:23 AM
To: Kyle Bruene
Cc: 'omnios-discuss at lists.omniti.com'
Subject: Ang: [OmniOS-discuss] Fibre Channel performance on OmniOS


-----"OmniOS-discuss" <omnios-discuss-bounces at lists.omniti.com> skrev: -----
Till: "'omnios-discuss at lists.omniti.com'" <omnios-discuss at lists.omniti.com>
Från: Kyle Bruene 
Sänt av: "OmniOS-discuss" 
Datum: 2014-08-19 21:02
Ärende: [OmniOS-discuss] Fibre Channel performance on OmniOS

Hi everyone,

 

Last year we built a “SAN” based on OmniOS r151008. Here are the specs:

2 x Xeon 6-core SNB

128GB DDR3 ECC

2 x 4 Port 4gbps Qlogic Fibre Channel cards

2 x 8 port 6gbps SAS controllers

2 x Brocade fibre switches.

5 x 1TB Crucial M550 SSD

5 x 3TB Seagate 7200rpm HDD

 

My issue is that I am only able to read/write to it at about 400-500MB/s sequential. There is plenty of cache so it seems like I should be able to get more speed with multipathing on. The hosts that are connecting to it are Windows Server 2012, but I’ve also tried an Ubuntu box with the same result. Is there anything I need to do on the OmniOS box to allow hosts to multipath to it? I’ve tried both Round Robin, Least Blocks, and Least Queue with no additional speed. It will use all the paths but will not go beyond that 500ish MBps limit. Does anyone have any insight into multipathing best practices?

 




Hi!

400-500 MegaByte/s is just what you should expect, from 4 Gbit/s fibre channel, IF YOU USE single port HBA's in the host.

Do you?

If you use dual port HBA's you should expect about the double.

You got multipath enabled, but the multipath isn't going to help you with performance, unless you provide more host ports. The only thing the multipath do with host single port is spreading the load over the target ports, but you're still limited at 4 Gbit/s.

Rgrds Johan





Thanks.

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