When a path is already optimized multipath failover will fail
with the message
Could not failover device X:Y: Handler scsi_dh_alua Error 15
Signed-off-by: Hannes Reinecke <h...@suse.de>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c
b/drivers/scsi/device_handler/scsi_dh_alua.c
index 51f4a31..dc77ce4 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -851,6 +851,8 @@ static unsigned alua_stpg(struct scsi_device *sdev, struct
alua_port_group *pg)
return SCSI_DH_RETRY;
}
switch (pg->state) {
+ case TPGS_STATE_OPTIMIZED:
+ return SCSI_DH_OK;
case TPGS_STATE_NONOPTIMIZED:
if ((pg->flags & ALUA_OPTIMIZE_STPG) &&
(!pg->pref) &&
@@ -865,10 +867,11 @@ static unsigned alua_stpg(struct scsi_device *sdev,
struct alua_port_group *pg)
break;
case TPGS_STATE_TRANSITIONING:
return SCSI_DH_RETRY;
- break;
default:
+ sdev_printk(KERN_INFO, sdev,
+ "%s: stpg failed, unhandled TPGS state %d",
+ ALUA_DH_NAME, pg->state);
return SCSI_DH_NOSYS;
- break;
}
/* Set state to transitioning */
pg->state = TPGS_STATE_TRANSITIONING;
--
1.7.12.4
--
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