Required space for change requests

Before you upgrade, know the number of objects that are being migrated to your central CR database so that you can estimate the space required. Overestimating the amount of space needed ensures that the CR migrate can be completed. It also allows for future growth of the central CR database.

Knowing the following information ensures that there is enough free space in the following locations.

The Rational Change installation area

While migrating CRs, each of your IBM® Rational® Change installations need a minimum of 500 MB of free space. If the underlying Rational Synergy installations are on different file systems, there must be 500 MB of free space on those file systems as well. This space is used to hold temporary copies of CRs while migrating. The space must be large enough to accommodate about 100 CRs, including their tasks and attachments.

Database server space

To determine the amount of space needed, determine the number of CRs, tasks, and attachments in your databases. When migrating multiple databases, sum the totals from each database. For every 1,000 objects in your total, you need about 5 MB of database server space.

For example, if your total is 11,500 objects, round up to 12,000. You need about 60 MB (12,000/1000 x 5 MB = 60 MB).

Use the ccmsrv expand command to increase your database server space. This command is located in your Rational Synergy installation.

File system space

The file system where your central CR database is located (for example, /vol/ccmdb/central_cr_db) needs enough free space to accommodate all the attachments you plan to migrate. When migrating multiple databases, sum the sizes of your attachments from each database.

Use the following Synergy CLI command to query for your attachments and their sizes in bytes in each development database:

ccm query "name match 'attachment*' and has_attr('attachment_size')" -f "%attachment_size"


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