Time slider is not working because the snapshot services fails to run:
cat /var/svc/log/system-filesystem-zfs-auto-snapshot:daily.log:
...
[ Jan 12 23:03:26 Leaving maintenance because clear requested. ]
[ Jan 12 23:03:26 Enabled. ]
[ Jan 12 23:03:26 Executing start method ("/lib/svc/method/zfs-auto-snapshot 
start"). ]
Checking for non-recursive missed // snapshots  rpool
Checking for recursive missed // snapshots home rpool/firefox rpool/ROOT
Last snapshot for svc:/system/filesystem/zfs/auto-snapshot:daily taken on Mo 
Jan  5  9:30 2009
which was greater than the 1 days schedule. Taking snapshot now.
cannot create snapshot 'home/zones/myzone/ROOT/zbe-2 at 
zfs-auto-snap:daily-2009-01-12-23:03': dataset is busy
no snapshots were created
Error: Unable to take recursive snapshots of home at 
zfs-auto-snap:daily-2009-01-12-23:03.
Moving service svc:/system/filesystem/zfs/auto-snapshot:daily to maintenance 
mode.
cannot create snapshot 'rpool/ROOT/opensolaris at 
zfs-auto-snap:daily-2009-01-12-23:03': dataset is busy
no snapshots were created
Error: Unable to take recursive snapshots of rpool/ROOT at 
zfs-auto-snap:daily-2009-01-12-23:03.
Moving service svc:/system/filesystem/zfs/auto-snapshot:daily to maintenance 
mode.
[ Jan 12 23:03:28 Method "start" exited with status 0. ]
[ Jan 12 23:03:28 Stopping for maintenance due to administrative_request. ]
[ Jan 12 23:03:28 Executing stop method ("/lib/svc/method/zfs-auto-snapshot 
stop"). ]
[ Jan 12 23:03:28 Method "stop" exited with status 0. ]
[ Jan 12 23:03:28 Stopping for maintenance due to administrative_request. ]
[ Jan 12 23:03:28 Stopping for maintenance due to administrative_request. ]
[ Jan 12 23:03:28 Stopping for maintenance due to administrative_request. ]

What does it mean "dataset is busy"? The snapshots should work independtly what 
kind there are of activity on the disk.
-- 
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