Creating Storage Spaces and Chunks

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Creating Storage Spaces and Chunks

You are responsible for planning and implementing the storage configuration. The way you distribute the data on disks affects the performance of the database server. A chunk is the same as a logical volume, logical unit, or regular file that has been assigned to the database server. The maximum size of an individual chunk is 4 terabytes. The number of allowable chunks is 32,766. A logical storage space is composed of one or more chunks.

Tip:

To take advantage of the large limit of 4 terabytes per chunk, assign a single chunk per disk drive. This way of distributing data increases performance.

After the database server is initialized, you can create storage spaces such as dbspaces, blobspaces, or sbspaces. Use the onspaces utility or ISA to create storage spaces and chunks.

You must create an sbspace if you are using the following functions:

J/Foundation (to hold Java JAR files)
Enterprise Replication (to hold spooled row data)
Smart large objects (BLOB and CLOB data types)
Multirepresentational data types (such as DataBlades or HTML data types)

For a description of storage spaces and other physical units such as tblspaces and extents, see Data Storage. For a discussion of the allocation and management of storage spaces, see Disk-Space Parameters and Managing Disk Space.

For more information, see the IBM Informix Dynamic Server Enterprise Replication Guide and J/Foundation Developer's Guide.