Public bug reported:

This is a request to add the following upstream commit to both Ubuntu
16.04.1 and 16.04.2:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/scsi/ses.c?id=9373eba6cfae48911b977d14323032cd5d161aae

Without this patch, the symlink in sysfs which binds a SAS device to an
enclosure slot does not get created. This makes disk hotplug near
impossible on large JBOD disk drawers.

You should be able to do:

ls /sys/block/sdb/device/ | grep enclosure

and see something like:

enclosure_device:1

If you cd to this directory, you can then access the SES controls for
that slot to flash the LED to assist in locating the disk to replace a
failed disk.

Currently with 16.04.1 and 16.04.2, these symlinks are not getting
created.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-155011 severity-critical 
targetmilestone-inin16041

** Tags added: architecture-ppc64le bugnameltc-155011 severity-critical
targetmilestone-inin16041

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 
(ubuntu-power-triage)

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

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https://bugs.launchpad.net/bugs/1693369

Title:
  5U84 - ses driver isn't binding right - cannot blink lights on 1 of
  the 2 5u84

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