Feature Details; Job Scheduling; Immediate Schedule; Delayed Schedule - HP StorageWorks 6400/8400 - Enterprise Virtual Array User Manual

Feature details

This section describes the features of the Data Migration Service. Because the current DMS is an
offline-only service, it is assumed that when a data migration job for the specified LUN starts,
applications (Microsoft Exchange, Oracle Applications, and other applications that are using the
source LUNs for data storage) and server access to the LUN is blocked. You do not need to bring
down these applications during the initial setup and configuration of DMS. DMS minimizes the
downtime by allowing the complete setup and configuration of data migration jobs (except for
immediate scheduling of the jobs) without bringing down the other applications. The application and
server must be offline only during the actual data migration.

Job scheduling

The mpx Manager for Data Migration Services multiple data migration job scheduling options to
optimize bandwidth and provide maximum usage of SAN resources. It provides a priority-based serial
scheduling feature that enables you to line up migration jobs and execute them in serial or parallel
fashion, based on available resources.
You can schedule data migration jobs for execution in the following three ways:
• Immediate Schedule (start now)
• Delayed Schedule (start at a later time within the next 30 days)
• Serial Schedule (priority-based scheduling)

Immediate schedule

Use the Immediate Schedule option to schedule a data migration job to instantly start data migration.
You must ensure that both the source and destination LUNs are not being accessed by any application
when this option is selected.

Delayed schedule

Use the Delayed Schedule option to schedule a data migration job to start at a later time. When you
select this option during configuration of a migration job, you are requested to enter the start time.
This allows you to configure a migration job during normal business hours and perform actual data
migration during off-peak hours, so that the application remains down only for a short period of time
and during the off-peak hours.

Serial schedule

The Serial Schedule option is designed to provide maximum flexibility for data migration. Even though
DMS supports 256 simultaneous migration jobs, typical array performance can be maximized by
having only 4 to 8 LUNs under migration. Serial scheduling of the job allows configuration of all 256
jobs at the same time, while having fewer active jobs at a time.
Serial scheduling allows you to configure migration jobs that can have the same or different priority.
If you need to configure a large number of jobs (256, for example), you can configure them in batches
such that the first four to eight jobs are scheduled at priority 1, the next four to eight jobs at priority
2, and so on. This scheduling arrangement ensures that when the serial schedule starts, no more than
four to eight jobs are running simultaneously, and DMS can provide better performance.
To achieve this, serial scheduling requires a job priority for each data migration job. Multiple data
migration jobs can have the same priority. Migration jobs with the same priority are run together.
140 Offline Data Migration