Unable to shutdown

[Eli Dart]

On 8/28/11 1:06 PM, Bengt Ahlgren wrote:
> Kevin Oberman<kob6558 at gmail.com>  writes:
>
>> I've run into an odd problem with dismounting file systems on a
>> Seagate Expansion portable
>> USB drive. Running 8-stable on an amd64 system and with two FAT32
>> (msdosfs) file systems
>> on the drive.
>>
>> The drive is "green" and spins down when idle.  If an attempt is made
>> to shutdown the
>> system while the drive is spun down, the system goes through the usual
>> shutdown including
>> flushing all buffer out to disk, but when the final disk access to
>> mark the file systems as
>> clean, the drive never spins up and the system hangs until it is
>> powered down. I've found no
>> way to avoid this other then to remember to access the disk and cause
>> it to spin up before
>> shutting down.
>>
>> If I attempt to unmount the file systems when the drive is shut down.
>> the same thing
>> happens, but I can recover as the second file system is still mounted
>> and an ls(1) to that file
>> system will cause the disk to spin up and everything is fine.
>>
>> This looks like a bug, but I don't see why the unmounting of an
>> msdosfs system does not
>> spin up the drive. It's clearly hanging on some operation that is not
>> spinning up the drive,
>> but does block.
>>
>> Any ideas what is going on? Possible fix?
>
> Not a solution to your problem, but a data point:
>
> I have a WD Passport 750GB (2.5") drive with an UFS filesystem on it.  I
> don't think I've tried shutdown with the drive mounted, but I've
> experienced no problems after the drive has spun down, including umount.
> There is just a delay while it spins up.  This is on 8.2-REL/i386, that
> is, with the new USB stack.

In my experience, the issues don't show up at lower capacities.  I've 
seen problems with 2TB drives, but 1TB and 1.5TB drives seem to work fine.

Kevin - how big is the disk in question?

Thanks,

		--eli

>
> Bengt
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-- 
Eli Dart                                            NOC: (510) 486-7600
ESnet Network Engineering Group (AS293)                  (800) 333-7638
Lawrence Berkeley National Laboratory
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