•The HP StorageWorks Disk Array XP (XP) is configured as Business Copy (BC) with mirrors configured with enough disk space.

•The SAN is properly configured in order to provide access to source (disks) and target (tape) devices from both the XCopy engine and the host where the Data Protector General Media Agent is running. This means that LUN masking and SAN zoning must be configured so that:

•The General Media Agent host has access to the XCopy engine

•The General Media Agent host has access to the target tape drive or library

•The SSEA host has access to the source disk

•The XCopy engine has access to the source disk

•The XCopy engine has access to the tape drive or library

About resolve

The Resolve program is a proprietary component of Data Protector that understands the native disk layout of many different file systems. Resolve allows Data Protector direct backup to back up data written by many kinds of operating systems without needing many servers running those operating systems.

Resolve examines the raw information on the disk and chooses the appropriate method of interpreting the disk’s file system. Note that Resolve does not read the data itself; it reads only information related to disk location. It then returns information suitable for direct input to the XCopy engine.

About XCopy

XCopy is a National Committee for Information Technology (NCITS) standard that allows two devices to communicate with one another without the help of another computer/server in between.

XCopy specifies a set of SCSI commands that, when given to an XCopy engine, allow the transfer of data from one device to another without the need to have a computer/server in between. The data flows from the source device (either block or streaming, i.e., disk or tape) to the destination device (either block or streaming) through XCopy.

It assumes that the streaming (tape) device is set up and the device is ready to write/read the data (that is, the drive is online, there is a tape in the drive, and the tape is properly positioned at the starting point for the write/read.) This frees the controlling server from reading the data from one device into its memory and then writing the information to the destination device. With XCopy, all the server does is send the XCopy commands to the XCopy engine and then wait for the results.

Concepts guide

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