| File system journaling, or logging, can allow reconstruction of file system data after a system crash, thus preserving the integrity of data that may have otherwise been lost. Journaling file systems typically do not require consistency checks upon booting after a crash, which can improve system availability. Some file systems employ other mechanisms to ensure consistency which also satisfy this requirement. Permanent not a finding - VMFS is a journaling file system. When a crash occurs, it does not run a full fsck on the volume, but merely checks the journal. A VMFS volume is used as a datastore to hold all of the files needed by virtual machines. The VMFS metadata is stored in files with the .sf extension in the root of the VMFS volume. This metadata keeps all hosts with access to the datastore informed of the current status of any object on the datastore. Metadata contains certain file system descriptors such as: Block Size, Number of Extents, Volume Capacity, VMFS Version, Volume Label, and VMFS UUID. |
