Hello all,
  I have a situation where zpool status shows no known data errors but all 
processes on a specific filesystem are hung.  This has happened 2 times before 
since we installed Opensolaris 2009.06 snv_111b.     For instance there are two 
files systems in this pool 'zfs get all' on one filesystem returns with out 
issue when ran on the other filesystem it hangs.  Also a 'df -h' hangs, etc.

This file system has many different operation running on it;
1) It receives incremental snapshot every 30 minutes continuously.
2) every night a clone is made from one of the received snapshot streams then a 
filesystem backup is taken on that clone (the backup is a directory traversal) 
once the backup completes the clone is destroyed. 

We tried to upgrade to the latest build but ran in to the current 'check sum' 
issue in build snv_122 so we rolled back.

# uname -a
SunOS lahar2 5.11 snv_111b i86pc i386 i86pc

# zpool status zdisk1
  pool: zdisk1
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        zdisk1      ONLINE       0     0     0
          raidz1    ONLINE       0     0     0
            c7t1d0  ONLINE       0     0     0
            c7t2d0  ONLINE       0     0     0
            c7t3d0  ONLINE       0     0     0
            c7t4d0  ONLINE       0     0     0
            c7t5d0  ONLINE       0     0     0
        spares
          c7t6d0    AVAIL

errors: No known data errors


The filesystem is currently in this 'hung' state,  is there any commands I can 
run to help debug the issue?

TIA
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