> is there any command to know the presence of ZFS file system on a device ?

fstyp is the Solaris command to determine what type of file system may be 
present on a disk:

  # fstyp /dev/dsk/c0t1d0s6
  zfs

> When a device is shared between two machines [ ... ]

You can use the same mount/unmount mechanism with ZFS, except that you will 
both need to unmount the file systems and export the pool.  It's critical that 
you export the pool from machine A before trying to access it from machine B.

> Can we create ZFS pools (or ZFS file system ) on VxVm volumes ? if so, how ?

Yes.  Just give the name of the VxVM volume to the 'zpool create' command, 
where the name of a disk would go.  [Disclaimer: I haven't tested this.]

> Can we share ZFS pools ( ZFS file system ) between two machines ?

If you mean, can you have a pool simultaneously mounted on two machines, the 
answer is no.  You must unmount/export the pool from one machine before 
allowing another machine to access it.

> Like fsck command on Linux, is there any command  to check the consistency of
> the ZFS file system ?

No.
 
 
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