Home > Storage > PowerMax and VMAX > Mainframe > Dell PowerMax: Data Protector for z Systems (zDP) Best Practices > zDP locking best practices
If you would like to IPL your LPAR and you did not stop zDP from running, zDP preserves the device locks for the devices in the VDG. The preservation of a device lock fails any subsequent zDP operations against those devices. Messages in SCF and SYSLOG will be displayed, preventing customers from shutting the SCF address space down. To investigate if device locking within zDP is causing the issue, consider the following:
F EMCSCF,DEV,DIS DEV(ucb)
F EMCSCF,REC,QRYDLOCK,TF,DE20,3,LCL,030,06
If the device is locked, the query returns the result SCF0723I the device is locked.
F EMCSCF,REC,RELDLOCK,TF,DE20,3,RMT,030,06