Thanks Alex. Works fine after the patch installation. I/O performance with 
slice options is about 350% greater than without slice. 

vdsdev without slice options
  root at ld2# ufsdump 0f - /opt|(cd /appl;ufsrestore rf -)
    DUMP: Date of this level 0 dump: Mon Jun 30 12:08:53 2008
    DUMP: Date of last level 0 dump: the epoch
    DUMP: Dumping /dev/rdsk/c0d0s4 (ld2:/opt) to standard output.
    DUMP: Mapping (Pass I) [regular files]
    DUMP: Mapping (Pass II) [directories]
    DUMP: Writing 32 Kilobyte records
    DUMP: Estimated 1819556 blocks (888.46MB).
    DUMP: Dumping (Pass III) [directories]
    DUMP: Dumping (Pass IV) [regular files]
  Warning: ./lost+found: File exists
    DUMP: 1819454 blocks (888.41MB) on 1 volume at 8844 KB/sec
    DUMP: DUMP IS DONE
  root at ld2 # cd /appl

vdsdev with slice options
root at ld2 # 
root at ld2 # ufsdump 0f - /opt|(cd /appl;ufsrestore rf -)
  DUMP: Date of this level 0 dump: Mon Jun 30 12:14:49 2008
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rdsk/c0d0s4 (ld2:/opt) to standard output.
  DUMP: Mapping (Pass I) [regular files]
  DUMP: Mapping (Pass II) [directories]
  DUMP: Writing 32 Kilobyte records
  DUMP: Estimated 1819556 blocks (888.46MB).
  DUMP: Dumping (Pass III) [directories]
  DUMP: Dumping (Pass IV) [regular files]
Warning: ./lost+found: File exists
  DUMP: 1819454 blocks (888.41MB) on 1 volume at 38759 KB/sec
  DUMP: DUMP IS DONE

Best Regards
Thiva
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