On 06/27/2010 10:17 AM, Sam Varshavchik wrote:
> Robert Nichols writes:
>
>> On 06/23/2010 04:24 AM, Richard Hughes wrote:
>>> On 23 June 2010 09:50, Tomasz Torcz<tomek@xxxxxxxxxxxxxx> wrote:
>>>> “/sbin/upsdrvctl is used as the near final step in /etc/init.d/halt
>>>> to command
>>>
>>> That's completely bogus. You really don't want to just power down the
>>> machine like that -- it might lead to disk corruption and is certainly
>>> not a good idea for a server with a huge power load.
>>>
>>> I really don't think we want this feature in Fedora.
>>
>> That action occurs after all filesystems have been unmounted and just
>> before /sbin/halt will be called to shut down the ATA power supply or
>> /sbin/reboot called to send control back to the BIOS. The OS has
>> already cleaned up for shutdown.
>
> The root filesystem is still mounted read/write, as I believe.
I added a line "touch /junkfile" in /etc/init.d/halt just prior to the
code that would turn off the UPS. The result was:
touch: cannot touch `/junkfile': Read-only file system
The code that remounts remaining file systems read-only is just a few
lines above that. The only time that's going to fail is if some hung
process resisted a "kill -9" and had a file open for writing. That's
going to result in a dirty file system regardless of how the shutdown
is done.
Shutting down the UPS is a requirement if you want the system to come
back up automatically when commercial power is restored. Otherwise,
the system will halt and never see a power remove/restore unless the
outage exceeds the battery life of the unloaded UPS.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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