Error code 800

Dear All,

Our system using the backup encryption , after power down for maintenance , I boot up the tape library and find the drive is down by run the tpconfig -d command but check on the drive is up on the NBU console.  I try to rebuild the sg drive but still the same problem.  May I know if there is any further step to do ?  Kindly advice to me .

Id DriveName Type Residence
SCSI coordinates/Path Status
****************************************************************************
0 Drive000 hcart2 Standalone
MISSING_PATH:{4,0,8,0}:HU140511EY DOWN

Currently defined robotics are:

EMM Server = devuaebms

C:\Program Files\VERITAS\Volmgr\bin>scan
************************************************************
*********************** SDT_TAPE ************************
*********************** SDT_CHANGER ************************
*********************** SDT_OPTICAL ************************
************************************************************
------------------------------------------------------------
Device Name : ""
Passthru Name: ""
Volume Header: ""
Port: 4; Bus: 0; Target: 8; LUN: 1
Inquiry : "STK SL150 0355"
Vendor ID : "STK "
Product ID : "SL150 "
Product Rev: "0355"
Serial Number: "464970G+1921SY8041"
WWN : ""
WWN Id Type : 0
Device Identifier: "STK SL150 464970G+1921SY8041"
Device Type : SDT_CHANGER
NetBackup Robot Type: 8
Removable : Yes
Device Supports: SCSI-5
Number of Drives : 2
Number of Slots : 30
Number of Media Access Ports: 4
Drive 1 Serial Number : "HU140511EY"
Drive 2 Serial Number : ""
Flags : 0x0
Reason: 0x0