zfs discuss - Apr 2007 - Re-write partition table cause the whole system crash

I''m using Open Solaris 10 doing some test on ZFS and
Zpool.I''ve encountered a situation that caused the system crash.
There are two SCSI disks connected to my computer, c1t0d0 was used as the
bootable disk, c1t1d0 was used to test ZFS and Zpool.

1. Formating c1t1d0 to four partitions:
format> fdisk
             Total disk size is 8924 cylinders
             Cylinder size is 16065 (512 byte) blocks

                                               Cylinders
      Partition   Status    Type          Start   End   Length    %
      =========   ======    ============  =====   ===   ======   ==          1  
Solaris2       4463  6693    2231     25
          2                 Solaris2       6694  7585     892     10
          3                 Solaris2       7586  8477     892     10
          4       Active    Solaris2          1  4462    4462     50

2. Creating a Zpool using the third partition:
# zpool create tank c1t1d0p3
# zpool list
NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
tank                   6.81G   51.5K   6.81G     0%  ONLINE     -
# 

3.Deleting all the partitions:
             Total disk size is 8924 cylinders
             Cylinder size is 16065 (512 byte) blocks

                                               Cylinders
      Partition   Status    Type          Start   End   Length    %
      =========   ======    ============  =====   ===   ======   ==



WARNING: no partitions are defined!

4.Destroying the zpool
# zpool destroy tank

After this command, the computer suddenly rebooted and stoped at
"GRUB".

And my questions are:
Why aren''t there any warnings when or after I modified the
disk''s partition ?
Why do the modifications to the second disk affect the first disk?

Thanks for any help!
 
 
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