[Bug 1569930] Re: Continuous messages from systemd: dm disk appears twice

[Martin Pitt]

I don't know what turns it on in the first place, so I cannot tell you
how to disable that, I'm afraid. You can try and explicitly set
LogLevel=info in /etc/systemd/system.conf (i. e. uncomment that line),
but I'm not sure whether that will help.

** Summary changed:

- Continuous messages from systemd: dm disk appears twice
+ debug messages are enabled by default

** Package changed: systemd (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: Won't Fix => Incomplete

** Summary changed:

- debug messages are enabled by default
+ debug messages are enabled

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Title:
  debug messages are enabled

Status in Ubuntu:
  Incomplete

Bug description:
  I have 4 servers running the latest 16.04 updates from the development
  branch (as of right now).

  Each server is connected to NetApp storage using iscsi software
  initiator. There are a total of 56 volumes spread across two NetApp
  arrays. Each volume has 4 paths available to it which are being
  managed by device mapper.

  While running IO to the iscsi targets my system log is flooded with
  messages that look like this:

  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-scsi\x2d360080e500029092400008d765605fa52.device: Dev dev-disk-by\x2did-scsi\x2d360080e500029092400008d765605fa52.device appeared twice with different sysfs paths /sys/devices/platform/host21/session8/target21:0:0/21:0:0:9/block/sdbh and /sys/devices/virtual/block/dm-59
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d765605fa52.device: Dev dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d765605fa52.device appeared twice with different sysfs paths /sys/devices/platform/host19/session6/target19:0:0/19:0:0:9/block/sdcd and /sys/devices/virtual/block/dm-59
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-scsi\x2d360080e50002909240000993956f4a1cb.device: Dev dev-disk-by\x2did-scsi\x2d360080e50002909240000993956f4a1cb.device appeared twice with different sysfs paths /sys/devices/platform/host21/session8/target21:0:0/21:0:0:121/block/sdej and /sys/devices/virtual/block/dm-37
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-wwn\x2d0x60080e50002909240000993956f4a1cb.device: Dev dev-disk-by\x2did-wwn\x2d0x60080e50002909240000993956f4a1cb.device appeared twice with different sysfs paths /sys/devices/platform/host19/session6/target19:0:0/19:0:0:121/block/sdfk and /sys/devices/virtual/block/dm-37
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-scsi\x2d360080e500029092400008d805605fa8b.device: Dev dev-disk-by\x2did-scsi\x2d360080e500029092400008d805605fa8b.device appeared twice with different sysfs paths /sys/devices/platform/host20/session7/target20:0:0/20:0:0:19/block/sdel and /sys/devices/virtual/block/dm-50
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d805605fa8b.device: Dev dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d805605fa8b.device appeared twice with different sysfs paths /sys/devices/platform/host19/session6/target19:0:0/19:0:0:19/block/sdew and /sys/devices/virtual/block/dm-50
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-scsi\x2d360080e500029092400008d785605fa5e.device: Dev dev-disk-by\x2did-scsi\x2d360080e500029092400008d785605fa5e.device appeared twice with different sysfs paths /sys/devices/platform/host18/session5/target18:0:0/18:0:0:11/block/sdcb and /sys/devices/virtual/block/dm-35
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d785605fa5e.device: Dev dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d785605fa5e.device appeared twice with different sysfs paths /sys/devices/platform/host20/session7/target20:0:0/20:0:0:11/block/sdcj and /sys/devices/virtual/block/dm-35
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-scsi\x2d360080e500029092400008d7a5605fa6a.device: Dev dev-disk-by\x2did-scsi\x2d360080e500029092400008d7a5605fa6a.device appeared twice with different sysfs paths /sys/devices/platform/host20/session7/target20:0:0/20:0:0:13/block/sdcw and /sys/devices/virtual/block/dm-44
  Apr  8 11:48:36 ICTM1612S02H2 systemd[1]: dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d7a5605fa6a.device: Dev dev-disk-by\x2did-wwn\x2d0x60080e500029092400008d7a5605fa6a.device appeared twice with different sysfs paths /sys/devices/platform/host21/session8/target21:0:0/21:0:0:13/block/sdcf and /sys/devices/virtual/block/dm-44

  It seems that systemd doesn't know what to do with dm devices and its
  "disk-by" simlinks.

  This is being tracked in NetApp bug tracker CQ number 860309.

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