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330 DS8000 Series: Concepts and Architecture
The Volume Performance Advisor is an automated tool to help the storage administrator pick
the best possible placement of a new LUN to be allocated from a performance perspective. It
uses the historical performance statistics collected from the managed devices and locates
unused storage capacity on the SAN that exhibits the best estimated performance
characteristics. Allocation optimization involves several variables that are user controlled,
such as the required performance level and the time of day/week/month of prevalent access.
This function is fully integrated with the DM function.
For detailed information about the installation and the use of TPC for Disk, refer to the
redbook
IBM TotalStorage Multiple Device Manager Usage Guide, SG24-7097.
15.5.3 TPC for Replication
TPC for Replication, formerly known as MDM Replication Manager, provides a single point
of control for all replication activities. Given a set of source volumes to be replicated, it will find
the appropriate targets, perform all the configuration actions required, and ensure the source
and target volumes relationships are set up.
TPC for Replication administers and configures the copy services functions of the managed
storage systems and monitors the replication actions. It can manage two types of copy
services: the Continuous Copy, also known as Peer-to-Peer Remote Copy (PPRC) and the
Point-in-time Copy, also known as FlashCopy.
It supports replication sessions, which ensure that data on multiple related heterogeneous
volumes is kept consistent, provided that the underlying hardware supports the necessary
primitive operations. Multiple pairs are handled as a consistent unit,
Freeze-and-Go functions
can be performed when mirroring errors occur. It is designed to control and monitor the data
replication operations in large-scale customer environments.
TPC for Replication provides a user interface for creating, maintaining, and using volume
groups and for scheduling copy tasks. It populates the lists of volumes using the DM interface.
An administrator can also perform all tasks with the TPC for Replication command-line
interface.
15.6 Global Mirror Utility
The DS8000 Global Mirror Utility (GMU) is a standalone tool to provide a management layer
for IBM TotalStorage Global Mirror failover and failback (FO/FB). It provides clients with a set
of twelve basic commands that utilize the DS Open-API to accomplish either a planned or
unplanned FO/FB sequence.
The purpose of the GMU is to automate the complex sequence of steps necessary to set up
and manage Global Mirror relationships for a large number of LUNs. There is no limitation to
the number of volumes managed by GMU.
In the event of a planned or unplanned FO/FB, the system administrator issues a few GMU
commands to recover consistent data on the remote site before he starts host I/O activities.
The GMU commands can be incorporated in user scripts or utilities to further automate
datacenter operations. However, IBM does not support such scripts or utilities without a
specific service arrangement.
The GMU is distributed on a separate CD with the DS8000 Licensed Internal Code (LIC). It
includes installation instructions and a user guide. It consists of two components, a server
and a client. The server receives requests from the client and communicates over TCP/IP to