How to troubleshoot slow fedora-wait-storage.service?

[Andy Lawrence]

My system is a fresh F16rc3, XFCE all updates on a fast Sandy Bridge and
SSD, check out my super long boot delay below.  How do I troubleshoot this
to see what is going wrong?

6469ms fedora-wait-storage.service

Long files don't show anything interesting to me.

Thanks
Andy

[Michał Piotrowski]

Hi,

2011/9/30 Andy Lawrence :
> My system is a fresh F16rc3, XFCE all updates on a fast Sandy Bridge and
> SSD, check out my super long boot delay below.  How do I troubleshoot this
> to see what is going wrong?
> 6469ms fedora-wait-storage.service

ExecStart=-/sbin/rmmod scsi_wait_scan
ExecStart=-/sbin/modprobe scsi_wait_scan
ExecStart=-/sbin/rmmod scsi_wait_scan

It seems that removing/loading/removing scsi_wait_scan module takes
some time on your system. This could be a kernel or hardware specific
problem.
> Long files don't show anything interesting to me.

How about dmesg?
> Thanks
> Andy
>
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[Andy Lawrence]

2011/9/30 Michał Piotrowski
> Hi,
>
> 2011/9/30 Andy Lawrence :
> > My system is a fresh F16rc3, XFCE all updates on a fast Sandy Bridge and
> > SSD, check out my super long boot delay below.  How do I troubleshoot
>
> this
> > to see what is going wrong?
> > 6469ms fedora-wait-storage.service
>
> ExecStart=-/sbin/rmmod scsi_wait_scan
> ExecStart=-/sbin/modprobe scsi_wait_scan
> ExecStart=-/sbin/rmmod scsi_wait_scan
>
> It seems that removing/loading/removing scsi_wait_scan module takes
> some time on your system. This could be a kernel or hardware specific
> problem.
> > Long files don't show anything interesting to me.
>
> How about dmesg?
> > Thanks
> > Andy

Thanks for the help!  It appears scsi_wait_scan isn't even getting loaded as
lsmod doesn't show it.  I moved the
file /lib/systemd/system/fedora-wait-storage.service out of the way, for
some reason you can't disable that particular service.  Anyhow the delay is
gone, woohoo!

I searched all the log files including dmesg, didn't see anything but I
could have easily missed it.  I also grep'ed for scsi_wait_scan in all with
no results.  Once booted that module loads instantly, I'll test more later
now that I know what is causing it!

Many thanks

[drago01]

On Fri, Sep 30, 2011 at 10:15 PM, Andy Lawrence  wrote:
> Thanks for the help!  It appears scsi_wait_scan isn't even getting loaded as
> lsmod doesn't show it.  I moved the
> file /lib/systemd/system/fedora-wait-storage.service out of the way, for
> some reason you can't disable that particular service.  Anyhow the delay is
> gone, woohoo!

systemctl mask fedora-wait-storage.service .. in 90% of the cases you
simply don't need it anyway.