Which SCSI instructions are used to build a bitmap of the changes between the first...

TheSCSI DIFFinstruction is used to build a bitmap of the changes between the first snapshot and subsequent snapshots when RecoverPoint is used with XtremIO1.

The DIFF protocol is a vendor-specific SCSI command which RecoverPoint uses to query XtremIO in order to obtain a bitmap of changes between two snapshot sets1.RecoverPoint uses the output of the DIFF command to read the actual data and transfer it to the target side1.

The other options provided are not typically used for this purpose:

SCSI DELTAis not a recognized SCSI command2.

SCSI TRANSFERis not a recognized SCSI command3.

SCSI UPDATEis not a recognized SCSI command4.

Therefore, the verified answer is A.SCSI DIFF, as it is the SCSI instruction used to build a bitmap of the changes between the first snapshot and subsequent snapshots when RecoverPoint is used with XtremIO1.