<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Sorry, left off a few key details:<div> </div><div>I'm running the following:</div><div> </div><div>redhat 5.3 x86_64</div><div>device-mapper-1.02.28-2.el5</div><div>device-mapper-multipath-0.4.7-23.el5_3.4</div><div> </div><div>Let me know if there are other details that would be helpful.</div><div> </div><div>-Eli <div><div> </div><div>On Sep 30, 2009, at 10:41 AM, Eli Klein wrote:</div> <blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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. <div><div> </div><div>Thanks in advance for any help or suggestions!</div><div> </div><div>-Eli</div><div> </div><div>I've included my multipath.conf as well as output from multipath -ll below:</div><div> </div><div>multipath.conf:</div><div> </div></div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;">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 }</blockquote><div><div><div> </div><div>multipath -ll:</div><div> </div></div></div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;">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]</blockquote></div></blockquote></div> </div></body></html>