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[Bryce Harrington <1569843@xxxxxxxxxxxxxxxxxx>]

[Standard support has ended for Trusty]

** Changed in: smartmontools (Ubuntu Xenial)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1569843

Title:
  smartd spindown check fails on newer disks, disabling check. Disks
  then spin-up when polled for SMART data.

Status in smartmontools package in Ubuntu:
  Fix Released
Status in smartmontools source package in Xenial:
  Won't Fix

Bug description:
  Problem:

  Support for additional power modes in modern disks like Seagate
  ST8000AS0002 causes reporting of some power states as "unknown". Where
  smartd checks disk while these additional states are active, it
  detects that the disk fails to comply with ATA standard and ceases to
  use the -n directive. From then on, smartd will check the disk
  regardless of current power mode, causing the disk to wake from idle
  every time smartd polls the disk state.

  Symptoms:

  * Initially, disks do not wake from standby as smartd detects that they are idle.
  * At some point, smartd polls disk when in "unknown" power state. The following appears in /var/log/syslog:
    "Device: <DISK>, CHECK POWER STATUS returned 130, not ATA compliant, ignoring -n Directive" OR
    "Device: <DISK>, CHECK POWER STATUS returned 129, not ATA compliant, ignoring -n Directive"
  * Following this, disk wakes from standby (spins up) every time smartd polls for SMART status.

  What should have happened:

  Support for more recent version of ATA spec for power modes is
  included in updated smartmontools. By updating, smartmontools will not
  detect more recent disks as not supporting ATA specification and as
  such, will not disable -n directive. As such, smartmontools will
  continue to check if disks are spun down before polling for SMART
  data.

  --> As an aside, and more of an upstream issue, but a better check for
  smartmon to perform would be "is the disk in known sleep/standby power
  state" directly before waking it every time, rather than detecting if
  the disk is ever in an unknown power state and disabling the check.
  This has the advantage of not breaking the "do not wake from sleep to
  poll for SMART data" function if further power modes are added to the
  ATA spec in future revisions as long as no new sleep/standby modes are
  added...

  Cause:

  Current version of smartd is r4214. Support for ACS-2 disks not included.
  See smartmontools ticket here: https://www.smartmontools.org/ticket/184
  Patch included 27/3/16 in r4255 (smartd) and r4256 (smartctl). (About two weeks ago).

  Ubuntu version:

  Description:	Ubuntu Xenial Xerus (development branch)
  Release:	16.04

  Smartmontools version:

  smartmontools:
    Installed: 6.4+svn4214-1
    Candidate: 6.4+svn4214-1
    Version table:
   *** 6.4+svn4214-1 500
          500 http://au.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

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