Re: Best way to create multiple TCP flows on 10 Gbps link

2014-08-26 Thread learner.study 
iperf performance for TCP is line rate in both directions using 3 threads

However, I can just get 700MB/s Write and 570MB/s Reads with iSCSI.

Thanks for any pointers!

On Tuesday, August 26, 2014 1:11:59 PM UTC-7, learner.study wrote:

 Another related observation and some questions; 

 I am using open iscsi on init with IET on trgt over a single 10gbps link 

 There are three ip aliases on each side 

 I have 3 ramdisks exported by IET to init 

 I do  iscsi login 3 times, once using each underlying ip address and 
 notice that each iscsi session sees all 3 disks. 

  Is it possible to restrict such that each init only sees one separate 
 disk? 

 When I run fio on each mounted disk, I see that only two underlying tcp 
 sessions are being used - that limits the perf. 
 Any ideas on how to overcome this? 

 Thanks! 


 Sent from my iPhone 

 On Aug 26, 2014, at 12:53 PM, Mark Lehrer m...@knm.org wrote: 

  On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr al...@iplink.net wrote: 
  
  I am trying to achieve10Gbps in my single initiator/single target 
  env. (open-iscsi and IET) 
  
  On a semi-related note, are there any good guides out there to 
  tuning Linux for maximum single-socket performance?  On my 40 gigabit 
  
  You are likely getting hit by the bandwidth-delay product. 
  Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product 
  and http://www.kehlet.cx/articles/99.html 
  
  Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. 
 Unfortunately that is still only about 10% of the available bandwidth. 
  
  I'll keep on tweaking and see how far I can take it. 
  
  Thanks, 
  Mark 
  
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On Tuesday, August 26, 2014 1:11:59 PM UTC-7, learner.study wrote:

 Another related observation and some questions; 

 I am using open iscsi on init with IET on trgt over a single 10gbps link 

 There are three ip aliases on each side 

 I have 3 ramdisks exported by IET to init 

 I do  iscsi login 3 times, once using each underlying ip address and 
 notice that each iscsi session sees all 3 disks. 

  Is it possible to restrict such that each init only sees one separate 
 disk? 

 When I run fio on each mounted disk, I see that only two underlying tcp 
 sessions are being used - that limits the perf. 
 Any ideas on how to overcome this? 

 Thanks! 


 Sent from my iPhone 

 On Aug 26, 2014, at 12:53 PM, Mark Lehrer m...@knm.org wrote: 

  On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr al...@iplink.net wrote: 
  
  I am trying to achieve10Gbps in my single initiator/single target 
  env. (open-iscsi and IET) 
  
  On a semi-related note, are there any good guides out there to 
  tuning Linux for maximum single-socket performance?  On my 40 gigabit 
  
  You are likely getting hit by the bandwidth-delay product. 
  Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product 
  and http://www.kehlet.cx/articles/99.html 
  
  Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. 
 Unfortunately that is still only about 10% of the available bandwidth. 
  
  I'll keep on tweaking and see how far I can take it. 
  
  Thanks, 
  Mark 
  
  -- 
  You received this message because you are subscribed to the Google 
 Groups open-iscsi group. 
  To unsubscribe from this group and stop receiving emails from it, send 
 an email to open-iscsi+unsubscr...@googlegroups.com. 
  To post to this group, send email to open-iscsi@googlegroups.com. 
  Visit this group at http://groups.google.com/group/open-iscsi. 
  For more options, visit https://groups.google.com/d/optout. 


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open-iscsi initiator and LIO-target

2009-06-18 Thread learner.study 

Hi:

I'm using open-iscsi initiator (version 2.0-870.3) with LIO (linux-
iscsi.org) iscsi target.

I have two initiators talking to LIO target on different GE
interfaces.

iSCSI target has two SAS disks and has setup access control so that
each initiator is allowed to access only one disk

When the first initiator tries to login, it is successful and it sees
the first disk. No issues.
When the second one tries to login, login is OK but it doesn't get any
disk access. The mesg on the LIO target side is
Unable to find Active iSCSI LUN: 0x on iSCSI TPG: 1

It seems like both of the initiators are requesting target to allow
access to LUN #0 (first disk).

Can someone please tell me how/where do I change the config of
initiator to tell it login to LUN #1 (and not the default LUN #0)?

Thanks a lot.
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open-iscsi initiator and LIO-target

2009-06-18 Thread learner.study 

Hi:

I'm using open-iscsi initiator (version 2.0-870.3) with LIO (linux-
iscsi.org) iscsi target.

I have two initiators talking to LIO target on different GE
interfaces.

iSCSI target has two SAS disks and has setup access control so that
each initiator is allowed to access only one disk

When the first initiator tries to login, it is successful and it sees
the first disk. No issues.
When the second one tries to login, login is OK but it doesn't get any
disk access. The mesg on the LIO target side is
Unable to find Active iSCSI LUN: 0x on iSCSI TPG: 1

It seems like both of the initiators are requesting target to allow
access to LUN #0 (first disk).

Can someone please tell me how/where do I change the config of
initiator to tell it login to LUN #1 (and not the default LUN #0)?

Thanks a lot.
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