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Operating Systems AIX ISCSI poor performance 1.5MB/s fresh install AIX7.1 Post 302977114 by frenchy59 on Tuesday 12th of July 2016 08:11:56 PM
Old 07-12-2016
Thanks for your help Scrutinizer.

"dd if=/dev/hdisk1 of=/dev/null bs=1024k" doesn't change anything ( also tried with 256k 512k)

running two dd command simultaneously give the same result :

---
one dd command :
Code:
Network    BPS  I-Pkts  O-Pkts    B-In   B-Out
Total    8.34M   5.94K   3.96K   8.05M    302K

two dd command simultaneously :
Code:
Network    BPS  I-Pkts  O-Pkts    B-In   B-Out
Total    8.36M   5.95K   3.97K   8.06M    302K

---

For info, a ftp from the linux iscsi target to AIX:
Code:
226 Transfer complete.
2310809600 bytes sent in 37.3 secs (61991.35 Kbytes/sec)
ftp>

the other way around gives the same result.

any other idea ?

---------- Post updated at 07:11 PM ---------- Previous update was at 06:22 PM ----------

For information, if I now setup the AIX as iSCSI target, and a linux as initiator :

--on linux iSCSI initiator :
Code:
dd if=/dev/sdb of=/dev/null
^C62697+0 records in
62696+0 records out
32100352 bytes (32 MB) copied, 16.6651 s, 1.9 MB/s


--topas on AIX iSCSI target :

Code:
Network    BPS  I-Pkts  O-Pkts    B-In   B-Out 
Total    1.66M   606.5   74.00   27.8K   1.63M

Note that my disk access on the AIX is pretty good, as I have 3 SAS disk on RAID 0, I hit pretty easily the 180MB/s, so that is not the issue here ...

Last edited by Scrutinizer; 07-13-2016 at 02:30 AM..
 

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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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