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The binary catalog can contain one or more image .f files. This type of file is also referred to as a files-file. The image .f file may be large because it contains the detailed backup selection list for each file backup. Generally, image files range in size from 1 kilobyte to 10 gigabytes.
The file layout determines whether the catalog contains one .f file or many .f files. NetBackup configures the file layout automatically, based on the size of the binary catalog. NetBackup uses one of two layouts: single file layout or multiple file layout.
Image .f file single file layout
NetBackup stores file information in a single image.f file if the information for the catalog is less than 4 megabytes.
When the backup file of one catalog backup is less than 4 megabytes, NetBackup stores the information in a single image.f file. The image.f file is always greater than or equal to 72 bytes, but less than 4 megabytes.
Image .f file multiple file layout
When the file information for one catalog backup is greater than 4 megabytes, the information is stored in multiple .f files: one main image .f file plus nine additional .f files.
Separating the additional .f files from the image .f file and storing the files in the catstore directory improves performance while writing to the catalog.
The main image.f file is always exactly 72 bytes.
-rw- 1 root other 72 Aug 30 00:40 test_1030680524_INCR.f -rw- 1 root other 804 Aug 30 00:08 catstore/test_1030680524_INCR.f-list -rw- 1 root other 1489728 Aug 30 00:39 catstore/test_1030680524_INCR.f_imgDir0 -rw- 1 root other 0 Aug 30 00:40 catstore/test_1030680524_INCR.f_imgExtraObj0 -rw- 1 root other 1280176 Aug 30 00:39 catstore/test_1030680524_INCR.f_imgFile0 -rw- 1 root other 192 Aug 30 00:40 catstore/test_1030680524_INCR.f_imgHeader0 -rw- 1 root other 0 Aug 30 00:40 catstore/test_1030680524_INCR.f_imgNDMP0 -rw- 1 root other 9112680 Aug 30 00:39 catstore/test_1030680524_INCR.f_imgRecord0 -rw- 1 root other 2111864 Aug 30 00:39 catstore/test_1030680524_INCR.f_imgStrings0 -rw- 1 root other 11 Aug 30 00:40 catstore/test_1030680524_INCR.f_imgUserGroupNames0