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Chapter 5. Planning data migration
This chapter provides planning guidelines for migrating data to the ESS. It includes
information to help you plan for the migration of data for the following hosts:
v UNIX, Windows NT, Windows 2000 and OS/400
v Host system views of the ESS
v System/390 hosts
UNIX, Windows NT, Windows 2000 and OS/400 host systems
For UNIX, Windows NT, Windows 2000, and OS/400 hosts systems, you can use a
variety of methods for copying or moving data from one disk drive to another. These
include, but are not limited to:
v Volume management software
v Direct copy with cpio -p
v AIX backup and restore commands
v The dump and restore commands
v Other commands
Your system administrator should select the method that is the best compromise
between efficiency and least impact on the users of the system:
v Management software provides simple robust methods that you can generally
v The AIX logical volume manager (LVM) provides methods that you can use at
© Copyright IBM Corp. 1999, 2000
Volume management software provides specific tools for wholesale movement of
data.
AIX, Solaris, and HP-UX all have volume management software that directly
controls the disks and storage devices attached to the system. It provides the
system administrator with tools for configuring and managing disk drives, file
systems, paging, and to exchange spaces. The software also provides the
operating system interface to the data.
The cpio command is a standard UNIX command for archiving and copying data.
The -p (pass) option allows the operating system to copy data between file
systems without the creation of an intermediate archive.
The cpio command reads a list of files to copy from its standard input. You
typically use it with the UNIX find command to copy complete directory
structures.
You commonly use these commands on AIX systems to archive and restore data.
However, they do not support a direct disk-to-disk copy. They require an
intermediate device such as a tape drive or spare disk drive to store the archive
that is created by the backup command.
These commands are similar in function to the AIX backup command and
restore command; you mostly find them on other forms of UNIX. They, too,
require an intermediate device.
Other UNIX commands provide archival functions, such as the tar command, that
you can use to transport data. Again, these commands require that you create an
intermediate archive, usually on a tape drive or spare disk drive.
use during production without disturbing users.
any time without disrupting access to the data by users. You may notice a small
performance degradation, but this is better than having to shut down databases
or require users to log off the system.
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