lkml.org 
[lkml]   [2007]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Weird hard disk noise on shutdown (bug #7674)
    2007/5/16, Rob Landley <rob@landley.net>:
    > (Is there any other piece of hardware that needs userspace to quiesce it just
    > so the _off_switch_ can take effect? Yes, I read both the gmane thread and
    > the linux-ata.org link. I used to maintain the busybox halt/reboot/poweroff
    > commands, although I don't anymore. That just called reboot(), and this
    > worked.)
    >

    For what i understood, there were a misunderstanding caused by the
    wrong assumption that shutdown(8) implementations were issuing
    STANDBYNOW on all hard disk devices on the system (indistinctly from
    the interface, old-ide/libata/scsi). The fact is that sysvinit and
    others actually do something with the old interface /proc/ide, trying
    to spindown the hard disks. This worked only on systems using the old
    ide/ata drivers because kernel prior to 2.6.22rc1 didn't even have the
    necessary feature to spindown hard disks using the libata or the scsi
    interface.

    Hopefully, with the patch in discussion, there will be an happy ending with:

    - sysvinit and derived implementations:
    if ( old ide/ata drivers are used )
    {continue to do the old userland spindown mechanism with /proc/ide; }
    // else
    // { do nothing; }
    reboot();

    - everyone else:
    // continue to do nothing :-)
    reboot();

    If exists some, at this point, exotic shutdown(8) implementation that
    is trying to issue STANDBYBOW on libata/scsi devices, it will get a
    fat warning. The warning could also state that the only supported way
    is to leave complete responsibility of spinning down the hard disks to
    kernel, so eventually it could be cleaned of checks and compatibility
    options.

    [1] http://article.gmane.org/gmane.linux.ide/18846
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-05-16 11:19    [W:4.236 / U:0.068 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site