> Excuse me if I'm mistaken, but I think the question is on the lines of how
to access and more importantly - Backup zfs pools/filesystems present on a
system by just booting from a CD/DVD.
>
> I think the answer would be on the lines of (forced?) importing of zfs
pools
> present on the system and then using "zfs send /foo | star ...". The OP
might be looking at something convenient along the lines of ufsdump.
>
> I think there is a need of a "zfsdump" tool (script?) or even better - zfs
integration in star. Maybe Jörg should chip in :-)
As a matter of fact you nailed down exactly what I was doing.
Except star had a problem with "locking an object" or some similar error
message. I simply tried the following :
power up the Sun machine
look at the ok prompt
type 'boot net -srv'
wait for a while until I get a SINGLE USER MODE hash prompt
type zfs import thus
.
.
.
Requesting System Maintenance Mode
SINGLE USER MODE
# zpool import
pool: zfs0
id: 13628474126490156099
state: ONLINE
action: The pool can be imported using its name or numeric identifier.
The pool may be active on on another system, but can be imported using
the '-f' flag.
config:
zfs0 ONLINE
c1t9d0 ONLINE
c1t10d0 ONLINE
c1t11d0 ONLINE
c1t12d0 ONLINE
c1t13d0 ONLINE
c1t14d0 ONLINE
then I did this
# mkdir /tmp/root/foo
# zpool import -f -R /tmp/root/foo 13628474126490156099
Then I could cd to various places in /tmp/root/foo and attempt to run star
to do a backup to tape. That didn't go so well as I got an error about not
being able to lock an object in memory. Also, you can't get star unless you
ftp it in from somewhere or have it on floppy/CDROM etc etc.
I reverted to good old tar like so :
tar -cvfPE /dev/rmt/0mbn .
then that blew up ( after three hours or more ) because I hit the end of the
tape and the process died.
So the long and short of it is that you can't drop a ZFS filesystem to tape
easily with any built in tools in the SXCR these days. There is already an
RFE filed on that but I think its low priority. You can recover a zpool
easily enough with zpool import but if you ever lose a few disks or some
disaster hits then you had better have Veritas NetBackup or similar in
place.
Dennis Clarke
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