By default, FILEDATA reports on the family named DISK. You can use the FAMILYNAME modifier to specify that a different disk family should be reported on.
If you run FILEDATA with the FAMILY task attribute set, this attribute can direct FILEDATA to report on different families than it otherwise would. For example, if the FAMILY task attribute value is "DISK = XPACK OTHERWISE DISK", then XPACK becomes the default family for FILEDATA reports. If the FAMILY value is "XPACK = DBFAM ONLY", and a FILEDATA task request uses the modifier FAMILYNAME = XPACK, then FILEDATA reports on family DBFAM instead. For a detailed explanation of the FAMILY task attribute, refer to the Task Attributes Programming Reference Manual.
FILEDATA overrides the effects of the FAMILY task attribute for task requests that include the GUARDFILE modifier. Refer to “GUARDFILE” later in this section.