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Operating Systems AIX ISCSI poor performance 1.5MB/s fresh install AIX7.1 Post 302977764 by cerber0 on Thursday 21st of July 2016 10:46:38 PM
Old 07-21-2016
I don't know if this can be useful
Quote:

Tune network options and interface parameters for maximum iSCSI I/O throughput on the AIX system as follows:
  • Enable the RFC 1323 network option.
  • Set up the tcp_sendspace, tcp_recvspace, sb_max, and mtu_size network options and network interface options to appropriate values. The iSCSI Software Initiator's maximum transfer size is 256 KB. Assuming that the system maximums for tcp_sendspace and tcp_recvspace are set to 262144 bytes, an ifconfig command used to configure a gigabit Ethernet interface might look like the following: ifconfig en2 10.1.2.216 mtu 9000 tcp_sendspace 262144 tcp_recvspace 262144
  • Set the sb_max network option to at least 524288, and preferably 1048576.
  • Set the mtu_size to 9000.
  • For some iSCSI targets, the TCP Nagle algoritm must be disabled for best performance. Use the no command to set the tcp_nagle_limit parameter to 0, which will disable the Nagle algorithm.
 

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LIBISCSI(3)						   BSD Library Functions Manual 					       LIBISCSI(3)

NAME
libiscsi -- iSCSI network storage protocol implementation LIBRARY
iSCSI protocol library (libiscsi, -liscsi) SYNOPSIS
#include <iscsi.h> int iscsi_target_set_defaults(iscsi_target_t *target); int iscsi_target_start(iscsi_target_t *target); int iscsi_target_listen(iscsi_target_t *target); int iscsi_target_shutdown(iscsi_target_t *target); void iscsi_target_write_pidfile(const char *filename); int iscsi_target_setvar(iscsi_target_t *target, const char *name, const char *value); char * iscsi_target_getvar(iscsi_target_t *target, const char *name); int iscsi_initiator_set_defaults(iscsi_initiator_t *initiator); int iscsi_initiator_start(iscsi_initiator_t *initiator); int iscsi_initiator_discover(iscsi_initiator_t *initiator, char *x, uint64_t a, int b); int iscsi_initiator_shutdown(iscsi_initiator_t *initiator); int iscsi_initiator_setvar(iscsi_initiator_t *initiator, const char *name, const char *value); char * iscsi_initiator_getvar(iscsi_initiator_t *initiator, const char *name); DESCRIPTION
libiscsi is a library interface to the iSCSI target and initiator. This conforms to IETF RFC 3720. The corresponding command line utilities for libiscsi are iscsi-initiator(8) and iscsi-target(8). In normal operation, a process acting as a target (i.e. presenting storage to the network) will call iscsi_target_set_defaults() and will then set various values using the iscsi_target_setvar() function. The value of a variable can be retrieved at any time using the iscsi_target_getvar() function. When all of the variables have been set, the iscsi_target_start() function is called, and the block storage will be served up by the process. A useful illustration of the use of these functions can be found in the source code to the iscsi-target(8) utility. The libiscsi library also provides an implementation of the client end of the iSCSI subsystem, which is known as the initiator. The process acting as an initiator will first call the iscsi_initiator_set_defaults() function, to set default values for the initiator variables. Once all the values have been set to the user preferences using the iscsi_initiator_setvar() function, then the iscsi_initiator_start() function is called. The libiscsi library can be used to perform iSCSI device discovery by calling the iscsi_initiator_discovery() function. This will return a list of all the iSCSI targets which are serving up block storage according to the variables which have already been set. SEE ALSO
iscsi-initiator(8), iscsi-target(8) HISTORY
The libiscsi library first appeared in NetBSD 4.0. This programmatic interface to the iSCSI subsystem first appeared in NetBSD 6.0. AUTHORS
Alistair Crooks <agc@NetBSD.org>. BSD
February 19, 2011 BSD
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