[zfs-discuss] how to reliably determine what is locking up my zvol?

[milosz]

-bash-3.2# zpool export exchbk
cannot remove device links for 'exchbk/exchbk-2': dataset is busy

this is a zvol used for a comstar iscsi backend:

-bash-3.2# stmfadm list-lu -v
LU Name: 600144F0EAC0090000004A0A4F410001
    Operational Status: Offline
    Provider Name     : sbd
    Alias             : /dev/zvol/rdsk/exchbk/exchbk-1
    View Entry Count  : 1
LU Name: 600144F0EAC0090000004A1307D20001
    Operational Status: Offline
    Provider Name     : sbd
    Alias             : /dev/zvol/rdsk/exchbk/exchbk-2
    View Entry Count  : 1

i offlined everything.  it's driving me nuts.
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