ADIC 601354 사용자 설명서

4-22

Normal Operations

601354 Rev A

In some cases, a medium may be moved to another archive 
because of a Mount Media command. Any medium that is 
ejected from the source archive by the AO, but not entered into 
the target archive, is placed in the intransit state. This state 
indicates that media are known by VolServ software and are 
destined for entry into an archive, but are not actually resident 
in an archive. 

The Lock Drive command is used to reserve a drive, a list of 
drives, or a drive pool for exclusive use. Locking a drive 
prevents its allocation by any Mount Media command that does 
not provide a lock identifier. The lock identifier is contained in 
the return status for a Lock Drive command. 

When reserved drives are no longer needed, the client issues an 
Unlock Drive command. The SA or SO may also issue an 
Unlock Drive command to free the drive. 

For detailed information about this command, refer to the 
VSCMD_Lock command in the MSTM-V21-010 API 
Programmer’s Guide. 

Only a client can issue a Lock Drive command via the API. 
Refer to 

. The Unlock Drive 

command is used to clear a locked drive so that it can be 
allocated to another mount. 

The unlock drive parameters are the unlock drive identifier and 
priority. The priority is used to determine the command location 
in VolServ command queue. 

At times it is necessary to make a drive unavailable for use. The 
Vary Drive command is used to disable a drive.