These system files are indexes and descriptors of the files on the VMFS filesystem and cannot be deleted.
- They may take more space if you have a small block size (more addresses).
- They may take less space if you have a large block size (less addresses).
- They are metadata files that are created when the volume is first set up.
- They cannot be changed and cannot be deleted.
- They may grow over time but not significantly.
The VMFS-3 file system organizes all space on disk in collections of resources. There are four resource types managed by the VMFS-3 file system: Blocks, sub-blocks, pointer blocks, and file descriptors.
Resources are grouped together into collections called CLUSTERs and clusters can be further grouped together into CLUSTER GROUPS.
Each resource type is managed by one of several system files which are created during the file system bootstrap process:
fbb.sf
- file block bitmap.system filefdc.sf
- file descriptor cluster.system filepbc.sf
- pointer block cluster.system filesbc.sf
- sub-block cluster.system filevh.sf
- vmfs heartbeat.system file- sdd.sf scsi device description.system file
The VMFS-5 file system uses one additional system file:
pb2.sf
- pointer block 2.system file
For more information, see
VMware vSphere 5.x FAQ for VMFS-5 (2003813).
Additional Information
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