Resending with requested rewording of the parameter description.
Currently ALUA device handler sends STPG command during failover and failback.
Failover can be optimized by implicit failover (by not to sending STPG command), when 1 is passed as hwhandler parameter in multipath.conf. ex "2 alua 1". We may need to pass the parameter through module param for alua device handler to optimize failover if incase retain_attached_hwhandler set in multipath.conf and hwhandler is set with non-tpgs device handler ex: '1 rdac'.
Signed-off-by: Vijay Chauhan <vijay.chauhan@xxxxxxxxxx>
Signed-off-by: Sean Stewart <Sean.Stewart@xxxxxxxxxx>
---
--- a/drivers/scsi/device_handler/scsi_dh_alua.c.orig 2013-03-27 12:18:35.000000000 +0530
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c 2013-03-27 13:23:16.000000000 +0530
@@ -710,6 +710,10 @@ static int alua_set_params(struct scsi_d
return result;
}
+static uint optimize_stpg;
+module_param(optimize_stpg, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(optimize_stpg, "Allow use of a non-optimized path,
+rather than sending a STPG, when implicit TPGS is supported (0=No,1=Yes). Default is 0.");
+
/*
* alua_activate - activate a path
* @sdev: device on the path to be activated @@ -731,6 +735,9 @@ static int alua_activate(struct scsi_dev
if (err != SCSI_DH_OK)
goto out;
+ if (optimize_stpg)
+ h->flags |= ALUA_OPTIMIZE_STPG;
+
if (h->tpgs & TPGS_MODE_EXPLICIT) {
switch (h->state) {
case TPGS_STATE_NONOPTIMIZED:
--
--
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