Limiting Chunk Size and Number

The maximum number of chunks that you can allocate for a given Extended Parallel Server depends on the value of the CONFIGSIZE or MAX_CHUNKS configuration parameter. If CONFIGSIZE is set to LARGE and MAX_CHUNKS is not set, the maximum number of chunks is 8192. However, you can use the MAX_CHUNKS parameter to specify up to 32,767 chunks. For more information on the CONFIGSIZE and MAX_CHUNKS configuration parameters, see the IBM Informix: Administrator's Reference and Increasing the Maximum Number of Dbspaces, Chunks, or Dbslices.

This maximum number of chunks is the total number of chunks across all coservers. For example, if you configure 10 coservers, the maximum number of chunks is 819 per coserver (if CONFIGSIZE is set to LARGE) or 3276 per coserver (if MAX_CHUNKS is set to 32,767).

Adding a Chunk with onutil

To add a chunk to a dbspace, use the onutil ALTER DBSPACE command.

This example adds a chunk of 5000 kilobytes of raw disk space, at an offset of 5200 kilobytes, to dbspace dbspc3 on coserver 2.

% onutil
1> ALTER DBSPACE dbsp3
2> CHUNK '/dev/dbsl_45' OFFSET 5200 size 5000
3> COSERVER eds.2;