07-27-2009
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LUN reservation is complex topic, because are involved many variants.
Is method to control the access a LUNS, regularly this is a cluster concept and prevent the simultaneous access to LUNS and prevent data corruption.
However in AIX, this keeps disks reservation when you "varyon" the volumegroup and will remove it when you "varyoff" volume groups
Exist two reservation methods SCSI-2 and SCSI-3.
If varyoff not released the reservation, then you could need one tool depending of the Storage vendor.
For example, EMC have scsi-reservation utility, HDS have DLMPR
Could you post more information to help you .