IBM Support

FILE device type using more space than expected

Question & Answer


Question

The Content Manager data is using more space than expected. Does the block size for the Tivoli Storage Manager Server FILE device type affect this?

Cause

When Content Manager stores objects on the Tivoli Storage Manager Server, the data is not aggregated, but will be stored as single individual objects. When being stored to the FILE device class, at least one block of space will be used even if the object is only a few K in size. This can cause space within this FILE stgpool to be wasted.

Answer

By default the FILE device class will have a block size of 256K. In those cases where there are very small objects which do not utilize the blocks efficiently, the dataformat=nonblock can be set to avoid wasted space. This will cause the allocations into this pool to be based upon the object size and not the normal 256K blocksize.

More information on this DATAFORMAT parameter can be found within the DEFINE STGPOOL command in the Tivoli Storage Manager Reference manual:


http://pic.dhe.ibm.com/infocenter/tsminfo/v6r3/topic/com.ibm.itsm.srv.ref.doc/r_cmd_stgpool_psa_define.html

[{"Product":{"code":"SSGSG7","label":"Tivoli Storage Manager"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Server","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"Version Independent","Edition":"Edition Independent","Line of Business":{"code":"LOB26","label":"Storage"}}]

Product Synonym

TSM

Document Information

Modified date:
17 June 2018

UID

swg21632854

Page Feedback