Date: Wed, 08 Apr 2009 14:20:11 -0700 From: George Hartzell <hartzell@alerce.com> To: freebsd-current@freebsd.org Subject: "zfs send -R data@now | zfs receive -vdF backups" odd behaviour Message-ID: <m0iqle4zck.fsf@alerce.com>
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[
I thought I sent this back in early March, but I never heard anything
and don't see in the archives, so I'm hoping that I dropped the ball.
]
I have a -CURRENT system csup'ed last night, with the small patch from
PR bin/130105 so that 'zfs send -R' works.
My system has two disks in a mirrored pool named data. The disks are
both partitioned using GPT (freebsd-boot, freebsd-swap, freebsd-zfs)
and use gptzfsboot.
I also have a third disk that is partitioned as above.
If I create a new zpool on that third disk named backups, take a
recursive snapshot of data and then send the filesystems stored on
data to backups, I end up with *one* filesystem mounted twice. In
other words, after doing the send and receive, /home has been mounted
from data/home and then also mounted from backups/home.
I'm confused about two points:
- all of the filesystems on data seem to have all of the same
attributes set, yet only data@home ends up mounted.
- why does anything from backups end up mounted?
Is the behavious I'm seeing to be expected?
I've attached a script below
Script started on Sat Mar 7 13:38:31 2009
> zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
data 276G 5.74G 271G 2% ONLINE -
> sudo zpool create backups ad13p3
Password:
> zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
backups 90.5G 73.5K 90.5G 0% ONLINE -
data 276G 5.74G 271G 2% ONLINE -
> sudo zfs destroy -r data@now
> sudo zfs snapshot -r data@now
> df
Filesystem 1K-blocks Used Avail Capacity Mounted on
data 279913472 530944 279382528 0% /
devfs 1 1 0 100% /dev
data/home 279382528 0 279382528 0% /home
data/tmp 279382528 0 279382528 0% /tmp
data/usr 284771072 5388544 279382528 2% /usr
data/var 279478912 96384 279382528 0% /var
backups 93413248 0 93413248 0% /backups
> sudo zfs send -R data@now | sudo zfs receive -vdF backups
receiving full stream of data@now into backups@now
received 521MB stream in 29 seconds (18.0MB/sec)
receiving full stream of data/home@now into backups/home@now
received 40.0KB stream in 1 seconds (40.0KB/sec)
receiving full stream of data/usr@now into backups/usr@now
received 5.34GB stream in 338 seconds (16.2MB/sec)
receiving full stream of data/var@now into backups/var@now
received 112MB stream in 14 seconds (8.02MB/sec)
receiving full stream of data/tmp@now into backups/tmp@now
received 99.7KB stream in 1 seconds (99.7KB/sec)
> df
Filesystem 1K-blocks Used Avail Capacity Mounted on
data 279912960 530944 279382016 0% /
devfs 1 1 0 100% /dev
data/home 279382016 0 279382016 0% /home
data/tmp 279382016 0 279382016 0% /tmp
data/usr 284770560 5388544 279382016 2% /usr
data/var 279478400 96384 279382016 0% /var
backups/home 87396864 0 87396864 0% /home
> sudo umount /home
Password:
> df
Filesystem 1K-blocks Used Avail Capacity Mounted on
data 279912960 530944 279382016 0% /
devfs 1 1 0 100% /dev
data/home 279382016 0 279382016 0% /home
data/tmp 279382016 0 279382016 0% /tmp
data/usr 284770560 5388544 279382016 2% /usr
data/var 279478400 96384 279382016 0% /var
> ^Dexit
Script done on Sat Mar 7 13:48:15 2009
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