diff options
| author |   Kiyoshi Ueda <k-ueda@ct.jp.nec.com> | 2009-06-22 10:12:27 +0100 |
|---|---|---|
| committer |   Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:27 +0100 |
| commit | fd5e033908b7b743b5650790f196761dd930f988 (patch) | |
| tree | cd264d11371b9410e98388e00f4d87459a5e6325 /drivers/md/Kconfig | |
| parent | dm mpath: add start_io and nr_bytes to path selectors (diff) | |
| download | linux-dev-fd5e033908b7b743b5650790f196761dd930f988.tar.xz linux-dev-fd5e033908b7b743b5650790f196761dd930f988.zip | |
dm mpath: add queue length load balancer
This patch adds a dynamic load balancer, dm-queue-length, which
balances the number of in-flight I/Os across the paths.
The code is based on the patch posted by Stefan Bader:
https://www.redhat.com/archives/dm-devel/2005-October/msg00050.html
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
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/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 36e0675be9f7..3b311d273346 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -249,6 +249,15 @@ config DM_MULTIPATH ---help--- Allow volume managers to support multipath hardware. +config DM_MULTIPATH_QL + tristate "I/O Path Selector based on the number of in-flight I/Os" + depends on DM_MULTIPATH + ---help--- + This path selector is a dynamic load balancer which selects + the path with the least number of in-flight I/Os. + + If unsure, say N. + config DM_DELAY tristate "I/O delaying target (EXPERIMENTAL)" depends on BLK_DEV_DM && EXPERIMENTAL |