Encrypted Volume and File System v2.0 Administrator Guide HP-UX 11i v3

Type 2 Software with kernel modules that access the file system (Virtual File System, VFS, or
HFS or VxFS). EVFS volumes configured in EVS mode support Type 2 software. EVFS
volumes configured in EFS mode do not support Type 2 software, unless specifically
stated. The NFS server daemon is an example of Type 2 software. Therefore, the NFS
client and server cannot be used with EFS volumes.
Type 3 Software with kernel components that directly access physical volumes and implement
file system or volume management functionality. EVFS does not supprt Type 3 software.
Examples of Type 3 software include Oracle Automatic Storage Management (ASM),
and file systems other than HFS and VxFS, such as Veritas Cluster File System (CFS)
and Clearcase Multiversion File System (MVFS). (This is not an exhaustive list and is
included only to provide examples of Type 3 software.)
Figure 2 illustrates the data paths for the software types described in the preceding list.
Figure 2 Software types
Physical Disk
Type 1: User applications
Type 2: Kernel daemons that
interface with VFS
Type 3: Kernel
Modules that
interface with
physical disks and
implement file
system or volume
management
functions
System Calls
Kernel
Virtual File System (VFS)
File Systems (HFS, VxFS)
EVFS
Pseudo-Driver
Logical Volume Managers
(LVM, VxVM)
16 Overview