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[dm-devel] Question regarding failback option in multipath.conf



I'm running into an issue where the failback option in multipath.conf is being ignored.  I've tried to set this to a value > 0 to cause dm to pause before reinstating a recovered path, but it reinstates the path immediately.  The same is true when setting the value to "manual", the path is reinstated immediately.  The delay is most useful when a ethernet switch has failed or rebooted.  During the boot of the switch, the interface comes up and drops again multiple times.  I'd love to be able to introduce a delay before DM marks the path as reinstated after a recovery.  This would save me the hassle of running into I/O errors (and occasional filesystem RO) as the path bounces while the switch is booting.  

Thanks in advance for any help or suggestions!

-Eli

I've included my multipath.conf as well as output from multipath -ll below:

multipath.conf:

blacklist {
        devnode "sda$"
#        devnode "*"
}

## By default, devices with vendor = "IBM" and product = "S/390.*" are
## blacklisted. To enable mulitpathing on these devies, uncomment the
## following lines.
#blacklist_exceptions {
#
device {
#
vendor "IBM"
#
product "S/390.*"
#
}
#}

## Use user friendly names, instead of using WWIDs as names.
defaults {
user_friendly_names yes
}
##
## Here is an example of how to configure some standard options.
##
#
defaults {
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout /bin/true
path_checker readsector0
rr_min_io 10
rr_weight priorities
failback 120
features "1 queue_if_no_path"
no_path_retry 1
user_friendly_name yes
}

multipath -ll:

mpath2 (36000eb3945b8703a00000000000000f4) dm-3 LEFTHAND,iSCSIDisk
[size=400G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 192:0:0:0 sdl 8:176 [active][ready]
 \_ 191:0:0:0 sdf 8:80  [active][ready]
mpath152 (36000eb3945b8703a0000000000001431) dm-2 LEFTHAND,iSCSIDisk
[size=300G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 186:0:0:0 sdh 8:112 [active][ready]
 \_ 185:0:0:0 sde 8:64  [active][ready]
mpath149 (36000eb3945b8703a0000000000001429) dm-5 LEFTHAND,iSCSIDisk
[size=300G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 189:0:0:0 sdc 8:32  [active][ready]
 \_ 190:0:0:0 sdi 8:128 [active][ready]
mpath151 (36000eb3945b8703a000000000000142d) dm-6 LEFTHAND,iSCSIDisk
[size=300G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 188:0:0:0 sdj 8:144 [active][ready]
 \_ 187:0:0:0 sdg 8:96  [active][ready]
mpath150 (36000eb3945b8703a0000000000001435) dm-4 LEFTHAND,iSCSIDisk
[size=200G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 184:0:0:0 sdk 8:160 [active][ready]
 \_ 183:0:0:0 sdd 8:48  [active][ready]

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