Moger, Babu 72d9e0f383 [SCSI] scsi_dh_alua: Optimize the STPG command ... This patch optimizes the set target port group(STPG) command. During our testing, we found that it is not optimal to send stpg command every time the path group switch happens. This patch uses PREF (preferred target port) bit with combination of flags passed by multipath user level tool to optimize this behaviour. If PREF bit is set then it issues a STPG command, otherwise it will let implicit transfer take place. By default there is no change in the behaviour. User tool needs to pass the parameter to make this change take effect. Patch has been tested on NetApp E series storage. Signed-off-by: Babu Moger <babu.moger@netapp.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Parallels.com>		2012-04-23 19:28:18 +01:00
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Kconfig	[SCSI] scsi_dh: add generic SPC-3 alua handler	2008-07-26 15:14:52 -04:00
Makefile	[SCSI] scsi_dh: add generic SPC-3 alua handler	2008-07-26 15:14:52 -04:00
scsi_dh_alua.c	[SCSI] scsi_dh_alua: Optimize the STPG command	2012-04-23 19:28:18 +01:00
scsi_dh_emc.c	[SCSI] scsi_dh_emc: Add a match function for emc device handler	2011-12-15 10:55:00 +04:00
scsi_dh_hp_sw.c	[SCSI] scsi_dh_hp_sw: Adding the match function for hp_sw device handler	2011-12-15 10:55:00 +04:00
scsi_dh_rdac.c	[SCSI] scsi_dh_rdac: Fix for unbalanced reference count	2012-02-22 12:15:19 -06:00
scsi_dh.c	[SCSI] scsi_dh: code cleanup and remove the references to scsi_dev_info	2011-12-15 10:55:00 +04:00