[Bug 151631] "Synchronizing SCSI cache" fails during(and delays) reboot/shutdown

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https://bugzilla.kernel.org/show_bug.cgi?id=151631

--- Comment #2 from icanrealizeum <icanrealizeum+bugzillakernelorg@gmail.com> ---
Created attachment 227801
  --> https://bugzilla.kernel.org/attachment.cgi?id=227801&action=edit
for systemd, /usr/lib/systemd/system-shutdown/debug.sh

Found workaround, thanks to this article:
https://unix.stackexchange.com/questions/55281/how-to-stop-waking-all-attached-drives-on-reboot-deactivating-swap/55417#55417

If I put the following in aforementioned debug.sh file then reboot is
instant(after the SCSI bug, of course):

#THIS:
#turn off drive cache
hdparm -W0 /dev/sda
#^^^^^^^^^^^^^^^^^^^^^^

#this was already here before:
#flush drive cache:
hdparm -F /dev/sda
hdparm -f /dev/sda

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