RE: Virtual Ethernet - Part II

["Ingvaldson, Scott" <scott.ingvaldson@xxxxxxxxxx>]

Thanks Pete -

That's exactly what I wanted to know.  This is a 550-8312-7154 and our
LIND matches yours.  I'm going to test some smaller files and see if I
can get anything close to your 29725 KB/sec. Transfer rate. 

Regards,

Scott Ingvaldson
Senior IBM Support Specialist
Fiserv Midwest


-----Original Message-----
From: Pete Helgren [mailto:Pete@xxxxxxxxxx] 
Sent: Thursday, January 24, 2008 5:09 PM
To: Midrange Systems Technical Discussion
Subject: Re: Virtual Ethernet - Part II

Scott,

Here is what I got at a customer who has a "relatively" new 520:

Line Configuration:

Line description . . . . . . . . . :   VETH0
Option . . . . . . . . . . . . . . :   *BASIC
Category of line . . . . . . . . . :   *ELAN
                                                  
Resource name  . . . . . . . . . . :   CMN03
Online at IPL  . . . . . . . . . . :   *YES 
Vary on wait . . . . . . . . . . . :   *NOWAIT
Network controller . . . . . . . . :   VETH0NET
Local adapter address  . . . . . . :   CEF3D0003002
Exchange identifier  . . . . . . . :   056ADB0F
Ethernet standard  . . . . . . . . :   *ALL
Line speed . . . . . . . . . . . . :   1G
Current line speed . . . . . . . . :   1G
Duplex . . . . . . . . . . . . . . :   *FULL
Current duplex . . . . . . . . . . :   *FULL
Maximum frame size . . . . . . . . :   8996       
Maximum controllers  . . . . . . . :   40

I tried to find a big enough file to approximate what you are doing:

FTP over VLAN:

small file:
48362688 bytes transferred in 1.627 seconds. Transfer rate 29725.926
KB/sec big file
5515090944 bytes transferred in 294.812 seconds. Transfer rate 18707.176

FTP over network

small file
48362688 bytes transferred in 5.215 seconds. Transfer rate 9274.044
KB/sec.
big file
 5515090944 bytes transferred in 599.517 seconds. Transfer rate 9199.229

Hope that is of some use.

Pete Helgren



Ingvaldson, Scott wrote:
> I'm having a hard time believing that disk is the bottleneck here.  
> That would make the VLAN run at the same speed as the network, not
slower.
> And I wouldn't be able to save this 60 GB library to a save file in 
> under 3 minutes.
>
> My apples to apples comparison run today:
>
> FTP over VLAN: 59521118976 bytes transferred in 4777.693 seconds.
> Transfer rate 12458.129 KB/sec.
>
> FTP over network: 59521118976 bytes transferred in 3808.596 seconds.
> Transfer rate 15628.102 KB/sec.
>
> Does anyone have any insight into the VLAN configuration or at least 
> some real world performance numbers?
>
> Regards,
>  
> Scott Ingvaldson
> Senior IBM Support Specialist
> Fiserv Midwest
>
>
> -----Original Message-----
> From: Luis Colorado [mailto:LuisC@xxxxxxxxxxxxxxxx]
> Sent: Thursday, January 24, 2008 9:25 AM
> To: Midrange Systems Technical Discussion
> Subject: RE: Virtual Ethernet - Part II
>
> Well, if you think about it, 21577 Kbytes/sec is roughly equivalent to
> 169 Mbits/sec, meaning that your transfers through the network were 
> using less than 10% of your 2Gb/sec network. Years ago, with 
> 10Mbit/sec and 100Mbit/sec network speeds, clearly the bottleneck was
the network.
> However, with your 2Gb/sec connections, your bottleneck is now your 
> system (more specifically, your disk).
>
> So, bottom line (and I don't know much about VLAN optimization), I 
> would say that this is as good as it gets.
>
>  -----Original Message-----
> From: 	midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx]  On Behalf Of Ingvaldson,
Scott
> Sent:	Thursday, January 24, 2008 10:00 AM
> To:	midrange-l@xxxxxxxxxxxx
> Subject:	Virtual Ethernet - Part II
>
> OK, the VLAN appears to be working as designed but I still have some 
> questions.
>  
> The speed of our Anynet transfers has increased by a factor 4 - 8.
> Transfers that were taking 3 - 4 hours now complete in 30 - 45
minutes.
> As long as I do them one at a time.  If I do more than one at a time 
> they slow considerably.
>  
> FTP transfers take the same amount of time using the VLAN as they did 
> running over the network.  Reported transfer rates are in the range of

> 12000 - 14000 KB/sec.  Strangely enough, I was able to hit 21577
KB/sec.
> on a 2 GB transfer, not using the VLAN, doing an FTP to a Network 
> Server!
>  
> An iNav monitor shows the VLAN utilization to be 8 - 10% when doing 
> FTP and up to 20% for SAVRSTxxx commands.  But if I run two 
> simultaneous SAVRSTxxx transfers the utilization drops to 15%, even if

> the transfers are initiated from different LPARs.
>  
> Is there some tuning that can be done to the VLAN or is this as good 
> as it gets?
>  
> Regards,
>  
> Scott Ingvaldson
> Senior IBM Support Specialist
> Fiserv Midwest
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