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authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2009-06-22 10:12:28 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 10:12:28 +0100
commitf392ba889b019602976082bfe7bf486c2594f85c (patch)
tree962e8f354dfe3df2021476412be8d1bcec8a03d0 /drivers/md/Kconfig
parentfd5e033908b7b743b5650790f196761dd930f988 (diff)
downloadlinux-f392ba889b019602976082bfe7bf486c2594f85c.tar.bz2
dm mpath: add service time load balancer
This patch adds a service time oriented dynamic load balancer, dm-service-time, which selects the path with the shortest estimated service time for the incoming I/O. The service time is estimated by dividing the in-flight I/O size by a performance value of each path. The performance value can be given as a table argument at the table loading time. If no performance value is given, all paths are considered equal. Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
-rw-r--r--drivers/md/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 3b311d273346..09f93fa68912 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -258,6 +258,16 @@ config DM_MULTIPATH_QL
If unsure, say N.
+config DM_MULTIPATH_ST
+ tristate "I/O Path Selector based on the service time"
+ depends on DM_MULTIPATH
+ ---help---
+ This path selector is a dynamic load balancer which selects
+ the path expected to complete the incoming I/O in the shortest
+ time.
+
+ If unsure, say N.
+
config DM_DELAY
tristate "I/O delaying target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL