gmirror magic ?
Eric Anderson
anderson at freebsd.org
Tue May 1 13:03:26 UTC 2007
On 05/01/07 07:24, Frans Haarman wrote:
> Can someone explain this to me ? I was testing gmirror/gstripe and
> decided to
> remove the vnode files stripe0 & stripe1. This resulted in a mirror
> which kept on
> working.....
>
>
> /dev/mirror/mirro0 on /mnt (ufs, local)
>
> DEVEL# ls /mnt/
> .snap anders test testje
>
> DEVEL# ls /data/STRIPING/
> create-image-file mnt mnt0
> mnt1
>
>
> DEVEL# mdconfig -l -u md1
> md1 vnode 512M /data/STRIPING/stripe0
> DEVEL# mdconfig -l -u md2
> md2 vnode 512M /data/STRIPING/stripe1
> DEVEL# mdconfig -l -u md123
> md123 vnode 512M /data/STRIPING/stripe1
Does that look right to you? You have 2 md devices using the same file?
> DEVEL# gmirror status
> Name Status Components
> mirror/mirro0 COMPLETE md2
> md123
Where exactly does the gstripe come in?
> DEVEL# dd if=/dev/zero of=where-does-this-go bs=1m count=512
I'm assuming your cwd was /mnt?
> /mnt: write failed, filesystem is full
> dd: where-does-this-go: No space left on device
> 431+0 records in
> 430+0 records out
> 450887680 bytes transferred in 67.178881 secs (6711747 bytes/sec)
> DEVEL#
Ok - looks about right to me. You had a 512M mirror, and you wrote
enough to fill the file system up.. ? Right?
> This seems quite strange to me :) Its probably the way vnode disks are
> attached
> to the filesystem ?
I'm missing something. You might try to paint a bit clearer picture, as
it's pretty hard to understand what exactly we should be looking for..
Eric
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