I can't 100% exclude this is the issue and tried to investigate some time ago. 
Since Solaris by default seems to skip first 128k, it should be okay:

GNU Parted 1.8.8
Using /dev/rdsk/c4t6d0p0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
print
Model: Generic Ide (ide)
Disk /dev/rdsk/c4t6d0p0: 1500GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      131kB   1500GB  1500GB               zfs        
 9      1500GB  1500GB  8389kB

However I'm not 100% sure how ZFS handles this. Nevertheless it doesn't really 
explain, why the performance is okay, when I start the disk and it is degrading 
severely after some days.
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