FreeBSD 5.2.1-RC2 fs snapshot problems.
scottl at freebsd.org
Tue Feb 17 17:17:05 PST 2004
Don Lewis wrote:
> On 16 Feb, Joseph Scott wrote:
>> I just finished testing a fresh install of FreeBSD 5.2.1-RC2 and
>>have verified that the problem mentioned in PR kern/58154 is still there.
>>The problem is fairly simple to show:
>>1. Install a fresh 5.2.1-RC2 system.
>>2. Shutdown a few times to show that it completes correctly.
>>3. Create some snapshots of a filesystem (on 5.2.1-RC2 I did
>> 3 snapshots of /usr).
>>4. Try to shutdown again.
>>5. Watch your system hang forever, unable to complete a shutdown
>> I've done this samething on 3 different systems with the exact
>>same results every single time. If you cycle the power to reboot and then
>>delete the snapshot files shutdown is able to work completely once more.
>> I'm more than willing to try out patches or different
>>settings/options in an effort to try and track this down. I would be
>>thrilled to be able to use fs snapshots for systems at work, but as it
>>stands not being able to shutdown a system makes the snapshot feature
>> Sorry about cross posting this so much, but I've been trying to
>>raise the attention level of this problem for weeks now without any luck.
> I saw this as well a couple of months ago. I think I was running
There are fundamental issues with FFS snapshots and our buffer/cache
that are well beyond the scope of fixing for 5.2.1. If someone has an
idea of how to fix them for 5.3, all the better.
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