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Operating Systems AIX ISCSI poor performance 1.5MB/s fresh install AIX7.1 Post 302977891 by frenchy59 on Friday 22nd of July 2016 09:35:08 PM
Old 07-22-2016
Thanks for helping, I had already tested your recommendation but still the same.
I still think it is a limitation on AIX (a magic parameter to change?)
To prove it, I have now narrowed down this issue, I have installed RHEL 6.5 ppc64 on the p710 and set it up as iscsi initiator, the other RHEL 6.5 x86_64 physical (not a VM) as iscsi target
I have now really good iscsi transfer rate ! :

Code:
[root@localhost ~]# dd if=/dev/sdb of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 9.90109 s, 108 MB/s
[root@localhost ~]# dd if=/dev/sdb of=/dev/null
^C1633537+0 records in
1633536+0 records out
836370432 bytes (836 MB) copied, 10.6675 s, 78.4 MB/s

[root@localhost ~]#

Any idea ? any magic parameter on AIX to change that may help ?

Last edited by frenchy59; 07-22-2016 at 10:40 PM.. Reason: typo and add code tag
 

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ISCSI_INITIATOR(4)					   BSD Kernel Interfaces Manual 					ISCSI_INITIATOR(4)

NAME
iscsi_initiator -- kernel driver for the iSCSI protocol SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device iscsi_initiator Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): iscsi_initiator_load="YES" DESCRIPTION
This driver, along with its userspace counterpart iscontrol(8), is obsolete. Users are advised to use iscsi(4) instead. The iscsi_initiator implements the kernel side of the Internet SCSI (iSCSI) network protocol standard, the user land companion is iscontrol(8), and permits access to remote virtual SCSI devices via cam(4). SYSCTL VARIABLES
debug.iscsi_initiator set the debug-level, 0 means no debugging, 9 for maximum. net.iscsi.isid the initiator part of the Session Identifier. kern.cam.cam_srch_hi=1 allow search above LUN 7 for SCSI3 and greater devices. the following are informative only: net.iscsi.driver_version the current version of the driver. net.iscsi.sessions the number of current active sessions. net.iscsi.n.targetname is the targe name of session n. net.iscsi.n.targeaddress is the IP address of the target of session n. net.iscsi.n.stats are some statistics for session n net.iscsi.n.pid is the process id of the userland side of session n, see iscontrol(8). FILES
The iscsi_initiator driver creates the following: /dev/iscsi used to create new sessions. /dev/iscsi%d for each new session. SEE ALSO
cam(4), camcontrol(8), iscontrol(8) STANDARDS
iSCSI RFC 3720 AUTHORS
This software was written by Daniel Braniss <danny@cs.huji.ac.il> BUGS
The lun discovery method is old-fashioned. BSD
October 9, 2014 BSD
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