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Operating Systems AIX ISCSI poor performance 1.5MB/s fresh install AIX7.1 Post 302977093 by frenchy59 on Tuesday 12th of July 2016 12:25:38 PM
Old 07-12-2016
ISCSI poor performance 1.5MB/s fresh install AIX7.1

Hi Everyone,

I have been struggling for few days with iSCSI and thought I could get some help on the forum...

fresh install of AIX7.1 TL4 on Power 710, The rootvg relies on 3 SAS disks in RAID 0, 32GB Memory
The lpar Profile is using all of the managed system's resources.
I have connected only 1 physical gigabit ports on the AIX box to my iscsi target server (RHEL6 with tgt iscsi)
The network seems ok, a ftp transfer between AIX & RHEL6 is 125Mb/s
However the iSCSI transfer has really poor performance : if I do a "dd if=/dev/hdisk1 of=/dev/null" from my AIX box (on the iscsi lun), I only get 1.5Mb/s !

(Please note that initially, I wanted to setup one LPAR as iscsi target, and one lpar as iscsi initiator, both using virtual ethernet adapter, and I got the same performance 1.5Mb/s between the 2 AIX lpar ... Then I decided to investigate further and to setup the whole system as a iSCSI initiator and using one of my RHEL6 iscsi target that I know works well.)

I also tried to setup the AIX as iSCSI target and the RHEL6 as initiator, the performance gets better 8MB/s but still not acceptable, I would at least expect 30-40MB/s

Any idea guys ? please solve my 1 week headache.
 

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ISCSID(8)						   Linux Administrator's Manual 						 ISCSID(8)

NAME
iscsid - Open-iSCSI daemon SYNOPSIS
iscsid [OPTION] DESCRIPTION
The iscsid implements the control path of iSCSI protocol, plus some management facilities. For example, the daemon could be configured to automatically re-start discovery at startup, based on the contents of persistent iSCSI database. OPTIONS
[-c|--config=]config-file Read configuration from config-file rather than the default /etc/iscsi/iscsid.conf file. [-i|--initiatorname=]iname-file Read initiator name from iname-file rather than the default /etc/iscsi/initiatorname.iscsi file. [-f|--foreground] run iscsid in the foreground. [-d|--debug=]debug_level print debugging information. Valid values for debug_level are 0 to 8. [-u|--uid=]uid run under user ID uid (default is the current user ID) [-g|--gid=]gid run under user group ID gid (default is the current user group ID). [-n|--no-pid-file] do not write a process ID file. [-p|--pid=]pid-file write process ID to pid-file rather than the default /var/run/iscsid.pid [-h|--help] display this help and exit [-v|--version] display version and exit. FILES
/etc/iscsi/iscsid.conf The configuration file read by iscsid and iscsiadm on startup. /etc/iscsi/initiatorname.iscsi The file containing the iSCSI initiatorname and initiatoralias read by iscsid and iscsiadm on startup. /etc/iscsi/nodes Open-iSCSI persistent configuration database SEE ALSO
iscsiadm(8) AUTHORS
Open-iSCSI project <http://www.open-iscsi.org/> Alex Aizman <itn780@yahoo.com> Dmitry Yusupov <dmitry_yus@yahoo.com> July 2005 ISCSID(8)
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