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

[Tore Anderson]

Okay, sorry about the irrelevant verification on Vivid then. But I'd
like to point out that Trusty behaves exactly the same, i.e., the bug is
*not* fixed. Using the exact same multipath.conf as I mentioned in
comment #31 with multipath-tools on 0.4.9-3ubuntu7.9, I get the exact
same behaviour. That is, it is apparent that multipathd does read the
settings from the config file (as they're visible in output from
"multipathd -k'show config'"), but they're not being applied/written to
sysfs.

If I run use the command line utility in verbose mode to create the map,
it does claim that it opens the sysfs files in question, but strace
shows no sign of that actually happening:

root at ucstest:~# /etc/init.d/multipath-tools stop
 * Stopping multipath daemon multipathd                                                                                                                                                                                                 [ OK ]
root at ucstest:~# multipath -F
root at ucstest:~# strace -ff -eopen multipath -v4 |& egrep 'create:|_tmo'
Mar 08 07:48:38 | 3600c0ff0001204a9d12b755101000000: fast_io_fail_tmo = 16 (controller default)
Mar 08 07:48:38 | 3600c0ff0001204a9d12b755101000000: dev_loss_tmo = 2048 (controller default)
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:01.0/0000:07:00.0/host1/rport-1:0-1/fc_remote_ports/rport-1:0-1'/'dev_loss_tmo'
ort-1:0-1'/'fast_io_fail_tmo'
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:01.0/0000:07:00.0/host1/rport-1:0-2/fc_remote_ports/rport-1:0-2'/'dev_loss_tmo'
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:01.0/0000:07:00.0/host1/rport-1:0-2/fc_remote_ports/rport-1:0-2'/'fast_io_fail_tmo'
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:02.0/0000:08:00.0/host2/rport-2:0-1/fc_remote_ports/rport-2:0-1'/'dev_loss_tmo'
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:02.0/0000:08:00.0/host2/rport-2:0-1/fc_remote_ports/rport-2:0-1'/'fast_io_fail_tmo'
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:02.0/0000:08:00.0/host2/rport-2:0-2/fc_remote_ports/rport-2:0-2'/'dev_loss_tmo'
Mar 08 07:48:38 | open '/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:02.0/0000:08:00.0/host2/rport-2:0-2/fc_remote_ports/rport-2:0-2'/'fast_io_fail_tmo'
create: 3600c0ff0001204a9d12b755101000000 undef HP      ,P2000G3 FC/iSCSI

Note that this is a lab system, so if you'd like, you can have a look
yourself, Mathieu. Just send me a SSH pubkey on IRC and I'll set up a
user account for you.

Tore

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

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