ZFS root file system backup

I'm new to ZFS and have some question on it. I installed a solaris 10 system and used ZFS as its root file system. I created a flash archive using flarcreate and then tried to install the archive but It's failed. I got a error message during booting: "The file just loaded does not appear to be executable". Here are my question.

1. Does flarcreate support ZFS root system?
2. If not, is there any system backup solution for ZFS.
3. Solaris has UFS and ZFS. Which one is a better choice for root file system.

Thanks in advance.
tyknightAsked:
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Brian UtterbackConnect With a Mentor Principle Software EngineerCommented:
1. Not at this time.
2. Yes. Look at the "backup" subcommand of the zfs command. Man zfs.
3. Depends. If you want to use flar, then UFS.  Upgrading with ZFS and live upgrade is astoundingly simple. I upgraded my systems to ZFS root asd soon as it was available.
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tyknightAuthor Commented:
Thanks. I followed the procedure in http://docs.sun.com/app/docs/doc/817-2271/ghzur?a=view to backup and restore root pool but still failed. Here is the steps.

zpool set listsnapshots=on mpool

Backup...
1.zfs snapshot -r rootpool@0311
2.zfs send -Rv rootpool@20090402 > /mnt/backup/20090403.zfs

Restore...
1. Replace the root disk with a new harddisk
2. Boot from Solaris installation CD
3. zpool create -f -o failmode=continue -R /tmp/a -m legacy -o cachefile=/etc/zfs/zpool.cache rootpool c0t0d0s0
   i got an error after a few minutes  "cannot mount `/tmp/a': directory is not empty
4. zpool set bootfs=rootpool/ROOT/rootpool_root_dataset
5, reboot and got "The file just loaded does not appear to be executable".


What's wrong with the procedure?
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Brian UtterbackPrinciple Software EngineerCommented:
You probably don't want to use /tmp/a as the mountpoint. Since /tmp is of type swapfs, I don't know if everything will work the same. The semantics for swapfs are not exactly the same as the other file systems.  Usually you should use /a as the temporary root mount point.

Look at this link, it goes into a little more depth:
http://www.solarisinternals.com/wiki/index.php/ZFS_Troubleshooting_Guide#ZFS_Root_Pool_Recovery

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