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Date:      Sun, 24 Feb 2008 19:38:17 +0100
From:      =?ISO-8859-1?Q?Eirik_=D8verby?= <ltning@anduin.net>
To:        Guido Falsi <mad@madpilot.net>
Cc:        FreeBSD Stable <freebsd-stable@freebsd.org>
Subject:   Re: UFS snapshot weirdness
Message-ID:  <CE45BB81-E8B6-410C-9751-5D1770D7FD2C@anduin.net>
In-Reply-To: <47C03FE5.8030703@madpilot.net>
References:  <79029E40-6E43-4482-8E39-D1DE49C8C53A@anduin.net>	<200802122311.43247.doconnor@gsoft.com.au>	<5B010AC7-C292-45E6-A109-20E39B370604@anduin.net>	<200802131851.15014.doconnor@gsoft.com.au> <78796912-6D98-4433-A5C9-622854C7DFB2@anduin.net> <47C03FE5.8030703@madpilot.net>

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On Feb 23, 2008, at 4:46 PM, Guido Falsi wrote:

> Eirik =D8verby wrote:
>
>> I read somewhere else about NFS issues on 7-RC* where snapshots =20
>> have been used. In particular - and this is something I'm seeing =20
>> too - changing the exports file or reloading mountd gives the =20
>> following in messages log:
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for /=20
>> tmp: Invalid argument
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for /=20
>> usr: Cross-device link
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for /=20
>> var: Cross-device link
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for /=20
>> export/home: Cross-device link
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for /=20
>> opt: Cross-device link
>> Can this be related? I'm starting to worry here - what will be the =20=

>> long-term consequences if snapshots are stuck around in this =20
>> "invisible" state?

Ok there is definitely something VERY fishy going on here.
I have just removed a lot of data from one of the partitions where I =20
HAD snapshots (they are all gone now, since days). So freespace =20
initially goes up a lot, as expected, then drops to around what it was =20=

before the deletion took place. There IS a snapshot being maintained =20
somewhere, even though I have deleted it (using rm -f). What can I do, =20=

short of rebooting or remounting the filesystem??

This behavior is also seen on 6.2-RELEASE by the way; entirely =20
different hardware (32bit vs 64bit, scsi vs ide, etc.)

/Eirik


>>
>
> I have been experiencing these too. But it looks more like a bug in =20=

> mountd, since it shows up only is snapshots are created with mount. =20=

> If snapshots are created with mksnap_ffs this does not seem to show =20=

> up.
>
> I still have to make more in depth experiments, but before =20
> experimenting by myself I'd like to have some more informed =20
> directions on what to experiment.
>
> --=20
> Guido Falsi <mad@madpilot.net>
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