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

passphrase in a file, encrypted with system-specific data. At system startup, EVFS can
automatically retrieve stored passphrases and use the passphrases to execute EVFS
commands.
CAUTION: Stored passphrases provide convenience, but they are security risks.
• DLKM Support
This version of EVFS is DLKM aware. The kernel module of EVFS can be loaded into the
running kernel without needing to rebuild or reboot. The kernel module can also be unloaded
on demand from the running kernel without needing to rebuild or reboot the system.
• In-line Encryption
This feature allows conversion of an existing volume with clear-text data into an EVFS
managed encrypted volume without doubling the amount of storage. Inline encryption is
handled offline, and the volume is not accessible during the process until the entire operation
is completed.
• Kernel Tracing
The evfsadm trace command traces and captures EVFS kernel code flow information in
order to facilitate debugging and analysis on a live system. This command is intended for
use by support personnel only. HP does not support this feature on Customer Environments.
• Large I/O Performance
EVFS performance for large I/O requests is increased by the implementation of simultaneous
data processing.
• LVM DLO Support
LVM version 2.0 with DLO is supported by this release of EVFS on 11i v3.
• Serviceguard A.11.18 Support
Serviceguard A.11.18 is supported by this release of EVFS on 11i v2 Update 2 and 11i v3.
• Maximum Number of Volumes Support
The maximum number of volumes which can be mapped to EVFS supported by this release
is 1023, an increase from 127.
18 EVFS Introduction