It's useless, default path_selector is service-time.
And document some aspects of round-robin.
Cc: Kiyoshi Ueda <k-ueda@xxxxxxxxxxxxx>
Cc: Jun’ichi Nomura <j-nomura@xxxxxxxxxxxxx>
Cc: Mike Christie <mchristi@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
Cc: Christophe Varoqui <christophe.varoqui@xxxxxxxxxxx>
Cc: device-mapper development <dm-devel@xxxxxxxxxx>
Signed-off-by: Xose Vazquez Perez <xose.vazquez@xxxxxxxxx>
---
libmultipath/hwtable.c | 14 --------------
multipath/multipath.conf.5 | 20 ++++++++++++--------
2 files changed, 12 insertions(+), 22 deletions(-)
diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
index b74616b..11cf498 100644
--- a/libmultipath/hwtable.c
+++ b/libmultipath/hwtable.c
@@ -79,7 +79,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = FAILBACK_UNDEF,
.no_path_retry = 12,
- .minio = 100,
.checker_name = HP_SW,
.prio_name = PRIO_HP_SW,
},
@@ -90,7 +89,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 12,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
{
@@ -100,7 +98,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 12,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
{
@@ -110,7 +107,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = MULTIBUS,
.pgfailback = FAILBACK_UNDEF,
.no_path_retry = 18,
- .minio = 100,
},
{
/* MSA2000 family with new firmware */
@@ -119,7 +115,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 18,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
{
@@ -129,7 +124,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 18,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
{
@@ -140,7 +134,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 12,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
{
@@ -158,7 +151,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 18,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
/*
@@ -520,7 +512,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = NO_PATH_RETRY_QUEUE,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
{
@@ -530,7 +521,6 @@ static struct hwentry default_hw[] = {
.features = "1 queue_if_no_path",
.pgpolicy = MULTIBUS,
.pgfailback = FAILBACK_UNDEF,
- .minio = 15,
},
/*
* IBM Power Virtual SCSI Devices
@@ -577,7 +567,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.flush_on_last_del = FLUSH_ENABLED,
- .minio = 128,
.dev_loss = MAX_DEV_LOSS_TMO,
.prio_name = PRIO_ONTAP,
},
@@ -612,7 +601,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_SERIAL,
.pgfailback = FAILBACK_UNDEF,
.no_path_retry = 30,
- .minio = 128,
},
/*
* SGI
@@ -776,7 +764,6 @@ static struct hwentry default_hw[] = {
.features = "1 queue_if_no_path",
.pgpolicy = MULTIBUS,
.pgfailback = FAILBACK_UNDEF,
- .minio = 100,
},
/*
* Intel
@@ -800,7 +787,6 @@ static struct hwentry default_hw[] = {
.pgpolicy = GROUP_BY_PRIO,
.pgfailback = -FAILBACK_IMMEDIATE,
.no_path_retry = 12,
- .minio = 100,
.prio_name = PRIO_ALUA,
},
/*
diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
index 55fde22..fd4b1f2 100644
--- a/multipath/multipath.conf.5
+++ b/multipath/multipath.conf.5
@@ -7,7 +7,7 @@
.\"
.\" ----------------------------------------------------------------------------
.
-.TH MULTIPATH.CONF 5 2016-08-07 "Linux"
+.TH MULTIPATH.CONF 5 2016-08-09 "Linux"
.
.
.\" ----------------------------------------------------------------------------
@@ -163,7 +163,8 @@ kernel multipath target. There are three selector algorithms:
.TP 12
.I "round-robin 0"
Loop through every path in the path group, sending the same amount of IO to
-each.
+each. Some aspects of behavior can be controlled with the attributes:
+\fIrr_min_io\fR, \fIrr_min_io_rq\fR and \fIrr_weight\fR.
.TP
.I "queue-length 0"
Send the next bunch of IO down the path with the least amount of outstanding IO.
@@ -433,8 +434,9 @@ Default value is: \fBmanual\fR
.
.TP
.B rr_min_io
-The number of IO to route to a path before switching to the next in
-the same path group. This is only for BIO based multipath.
+Number of IO requests to route to a path before switching to the next in the
+same path group. This is only for \fIBlock I/O\fR(BIO) based multipath and
+only apply to \fIround-robin\fR path_selector.
.RS
.TP
Default value is: \fB1000\fR
@@ -443,8 +445,9 @@ Default value is: \fB1000\fR
.
.TP
.B rr_min_io_rq
-The number of IO requests to route to a path before switching to the
-next in the same path group. This is only for request based multipath.
+Number of IO requests to route to a path before switching to the next in the
+same path group. This is only for \fIRequest\fR based multipath and
+only apply to \fIround-robin\fR path_selector.
.RS
.TP
Default value is: \fB1\fR
@@ -467,11 +470,12 @@ Default value is: \fBmax\fR
.
.TP
.B rr_weight
-If set to \fIpriorities\fR the multipath configurator will assign
-path weights as "path prio * rr_min_io". Possible values are
+If set to \fIpriorities\fR the multipath configurator will assign path weights
+as "path prio * rr_min_io". Possible values are
.I priorities
or
.I uniform .
+Only apply to \fIround-robin\fR path_selector.
.RS
.TP
Default value is: \fBuniform\fR
--
2.7.4
--
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