IBM DATA MIGRATION SERVICES Brochure page 24

Storage migrations made simple.
Page 24
Highlights
An insurance company chose
Softek's TDMF UNIX (IP) software
because it was the least risky
option, requiring no reboots.
Not only did the migration not
require a reboot of any critical
service, but it also provided con-
tinuous application availability
and no loss or degradation of ser-
vice for end users.
Softek's TDMF UNIX (IP) software was chosen as the least risky option because
no system reboots were required. The migration was performed without requir-
ing a reboot of any critical service, continuous application availability was
maintained during data migration, and the migration was performed without
end users experiencing any loss or significant degradation in service.
Softek solution: global migration to new servers and new storage
1. In the initial phase, configurations were pre-created and user-customizable
scripts were written to unmount, replace the vfstab file, and remount file systems.
2. TDMF software was installed just prior to weekly shutdown with no dis-
ruption. Each server is configured in turn, with a total elapsed time of 15
minutes for TDMF installation and configuration.
3. A full refresh from source server A to target server A was conducted over
the course of a week. Big asynchronous buffer (BAB) absorbed peaks in
write activity on legacy servers to minimize CPU usage and prevent high
I/O load.
4. New versions of Oracle and other software preinstalled on target server A
were tested. Testing involved receiving multiple application-consistent ver-
sions of production disks on a daily basis. To avoid having to refresh from
the production disks every time, checkpoint and a chaining configuration
were used.
5. At the completion of the testing, journal wrote to target volumes to ensure
minimal data transfer on resynchronization.
6. During the next weekend's outage, applications on target server A were
brought up and pointed to the new storage volumes. Source server A was
taken out of service.