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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-TARGET(8) 					    BSD System Manager's Manual 					   ISCSI-TARGET(8)

NAME
iscsi-target -- service remote iSCSI requests SYNOPSIS
iscsi-target [-46DV] [-b block length] [-f configuration file] [-p port number] [-s maximum number of sessions] [-t target name] [-v verbose arg] DESCRIPTION
iscsi-target is the server for iSCSI requests from iSCSI initiators. iscsi-target listens for discovery and login requests on the required port, and responds to those requests appropriately. Options and operands available for iscsi-target: -4 iscsi-target will listen for IPv4 connections, and respond back using IPv4. This is the default address family. -6 iscsi-target will listen for IPv6 connections, and respond back using IPv6. -b blocksize Specify the underlying block size for iSCSI storage which will be served. The possible sizes are: 512, 1024, 2048, and 4096 bytes, with the default being 512 bytes. -D When this option is specified, iscsi-target will not detach itself from the controlling tty, and will not become a daemon. This can be useful for debugging purposes. -f configfile Use the named file as the configuration file. The default file can be found in /etc/iscsi/targets. See targets(5) for more informa- tion. -p port number Use the port number provided as the argument as the port on which to listen for iSCSI service requests from initiators. -s maximum number of sessions Allow the maximum number of sessions to be initiated when connecting to the target. -t filename The target name (as it appears to the iSCSI initiator) can be specified using this flag. -V iscsi-target will print the utility name and version number, and the address for bug reports, and then exit. -v argument The amount of information shown can be varied by using this command. Possible values of argument are net to show network-related information, iscsi to show iSCSI protocol-related information, scsi to show SCSI protocol information, and all to show information from all of the above arguments. FILES
/etc/iscsi/targets the list of exported storage /var/run/iscsi-target.pid the PID of the currently running iscsi-target SEE ALSO
targets(5) HISTORY
The iscsi-target utility first appeared in NetBSD 4.0. BSD
May 27, 2006 BSD
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