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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Peter Steele <psteele@webmail.maxiscale.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Is this a gmirror bug?
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> I've seen this kind of thing appear in my df output:
> linprocfs                   4       4         0   100%    /proc
>
> /dev/mirror/gm0d      4058062 -377792   4111210   -10%    /tmp
>
> /dev/mirror/gm0e     15231278 -113942  14126718    -1%    /var
>
> /dev/ad10s3e        121487580       4 111768570     0%    /v3
>
> /dev/ad8s3e         121487580       4 111768570     0%    /v2
>
> /dev/ad6s3e         121487580       4 111768570     0%    /v1
>
> /dev/ad4s3e         121487580       4 111768570     0%    /v0
>
>
>
> It's showing that two partitions in my gm0 partition are below 0%
> capacity. This is clearly wrong, but what does it mean?
>
it has nothing to do with gmirror - no matter if it's virtual disk (gm0 
that case) or physical, partition or not, it's just block device to UFS.

definitely it is some problem but with UFS here.

unmount this filesystems and do fsck_ffs -y on them