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authorJiri Pirko <jpirko@redhat.com>2009-09-25 03:28:09 (GMT)
committerDavid S. Miller <davem@davemloft.net>2009-10-07 08:07:39 (GMT)
commita549952ad323d68daf5b50bf716db895479af84c (patch)
treec819e8c33701696115c3d60b12ca95a0cd792291 /Documentation/networking
parent2d37a186cedc51502dbee71c16ae0fbd9114d62c (diff)
bonding: introduce primary_reselect option
In some cases there is not desirable to switch back to primary interface when it's link recovers and rather stay with currently active one. We need to avoid packetloss as much as we can in some cases. This is solved by introducing primary_reselect option. Note that enslaved primary slave is set as current active no matter what. Patch modified by Jay Vosburgh as follows: fixed bug in action after change of option setting via sysfs, revised the documentation update, and bumped the bonding version number. Signed-off-by: Jiri Pirko <jpirko@redhat.com> Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/bonding.txt42
1 files changed, 41 insertions, 1 deletions
diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index d5181ce..61f516b 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -1,7 +1,7 @@
Linux Ethernet Bonding Driver HOWTO
- Latest update: 12 November 2007
+ Latest update: 23 September 2009
Initial release : Thomas Davis <tadavis at lbl.gov>
Corrections, HA extensions : 2000/10/03-15 :
@@ -614,6 +614,46 @@ primary
The primary option is only valid for active-backup mode.
+primary_reselect
+
+ Specifies the reselection policy for the primary slave. This
+ affects how the primary slave is chosen to become the active slave
+ when failure of the active slave or recovery of the primary slave
+ occurs. This option is designed to prevent flip-flopping between
+ the primary slave and other slaves. Possible values are:
+
+ always or 0 (default)
+
+ The primary slave becomes the active slave whenever it
+ comes back up.
+
+ better or 1
+
+ The primary slave becomes the active slave when it comes
+ back up, if the speed and duplex of the primary slave is
+ better than the speed and duplex of the current active
+ slave.
+
+ failure or 2
+
+ The primary slave becomes the active slave only if the
+ current active slave fails and the primary slave is up.
+
+ The primary_reselect setting is ignored in two cases:
+
+ If no slaves are active, the first slave to recover is
+ made the active slave.
+
+ When initially enslaved, the primary slave is always made
+ the active slave.
+
+ Changing the primary_reselect policy via sysfs will cause an
+ immediate selection of the best active slave according to the new
+ policy. This may or may not result in a change of the active
+ slave, depending upon the circumstances.
+
+ This option was added for bonding version 3.6.0.
+
updelay
Specifies the time, in milliseconds, to wait before enabling a

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