[Bug 1435706] Re: DevLossTO, FastIoFailTO settings do not match multipath.conf expected values

[Tore Anderson]

To me fix doesn't actually appear to work. After upgrading to multipath-
tools 0.4.9-3ubuntu7.4on an amd64 trusty and rebooting, the
fast_io_fail_tmo and dev_loss_tmo values do not get written to sysfs:

$ grep . /sys/class/fc_remote_ports/*/*_tmo
/sys/class/fc_remote_ports/rport-2:0-0/dev_loss_tmo:30
/sys/class/fc_remote_ports/rport-2:0-0/fast_io_fail_tmo:off
/sys/class/fc_remote_ports/rport-2:0-1/dev_loss_tmo:30
/sys/class/fc_remote_ports/rport-2:0-1/fast_io_fail_tmo:off
/sys/class/fc_remote_ports/rport-3:0-0/dev_loss_tmo:30
/sys/class/fc_remote_ports/rport-3:0-0/fast_io_fail_tmo:off
/sys/class/fc_remote_ports/rport-3:0-1/dev_loss_tmo:30
/sys/class/fc_remote_ports/rport-3:0-1/fast_io_fail_tmo:off

The device stanza from multipath.conf contains the following:

	device {
		vendor			"DGC|EMC"
		product			"RAID [0-9]*|VRAID|SYMMETRIX.*"
		path_grouping_policy	group_by_prio
		getuid_callout		"/lib/udev/scsi_id --whitelisted --device=/dev/%n"
		path_selector		"round-robin 0"
		path_checker		emc_clariion
		features		"0"
		hardware_handler	"1 emc"
		prio			emc
		failback		immediate
		rr_weight		uniform
		no_path_retry		queue
		rr_min_io		100
		fast_io_fail_tmo	3
		dev_loss_tmo		2147483647
	}

FWIW, I can manually set the sysfs settings to the desired values:

$ echo 3 | sudo tee /sys/class/fc_remote_ports/rport-*/fast_io_fail_tmo
3
$ echo 2147483647 | sudo tee /sys/class/fc_remote_ports/rport-*/dev_loss_tmo
2147483647
$ grep . /sys/class/fc_remote_ports/*/*_tmo
/sys/class/fc_remote_ports/rport-2:0-0/dev_loss_tmo:2147483647
/sys/class/fc_remote_ports/rport-2:0-0/fast_io_fail_tmo:3
/sys/class/fc_remote_ports/rport-2:0-1/dev_loss_tmo:2147483647
/sys/class/fc_remote_ports/rport-2:0-1/fast_io_fail_tmo:3
/sys/class/fc_remote_ports/rport-3:0-0/dev_loss_tmo:2147483647
/sys/class/fc_remote_ports/rport-3:0-0/fast_io_fail_tmo:3
/sys/class/fc_remote_ports/rport-3:0-1/dev_loss_tmo:2147483647
/sys/class/fc_remote_ports/rport-3:0-1/fast_io_fail_tmo:3

Tore

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Title:
  DevLossTO, FastIoFailTO settings do not match multipath.conf expected
  values

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