Encrypted Volume and File System v1.1 Administrator's Guide

Supported Software
Software used with EVFS can be categorized into three types:
• Type 1 Software: Applications without kernel components. EVFS supports Type 1 Software.
Examples of Type 1 software include FTP, rcp, CIFS Server, and Oracle® Database 10g.
(This list is not exhaustive and is included only to provide examples of Type 1 Software.)
• Type 2 Software: Software with kernel modules that access the file system (Virtual File
System, VFS, or HFS or VxFS). EVFS supports Type 2 Software. The NFS server daemon is
an example of Type 2 software.
• Type 3 Software: 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 1-4 illustrates the data paths for the software types described in the preceding list.
Figure 1-4 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)
26 EVFS Introduction