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

Step 4: Starting the EVFS Subsystem
You must start the EVFS subsystem to create EVFS keys and volumes. Starting the EVFS
subsystem does not enable encryption of the EVFS volume. You must still create the EVFS
volumes and enable EVFS for each volume.
To start the EVFS subsystem, enter the following command:
evfsadm start [-n number_threads]
where:
-n number_threads
Specifies the number of threads to create for EVFS encryption and
decryption processing.
Range: On single-processor systems, 1 is the only valid value.
On multiprocessor systems, the maximum number of threads is the
number of processors in the system.
Default: On single-processor systems, the default is 1.
On multiprocessor systems, the default is the number of processors
in the system minus 1. Setting the number of threads to a lower value
can decrease EVFS throughput.
The evfsadm start command starts the EVFS subsystem by initializing the EVFS pseudo-driver
and starting the evfsevold process. The evfsevold process starts kernel threads for data
encryption and decryption. You must start the EVFS subsystem to generate EVFS user keys and
enable EVFS volumes. This command is automatically executed at system startup if EVFS is
enabled in the /etc/rc.config.d/evfs file. See “Step 5: (Optional) Configuring the Autostart
Feature” (page 62) for more information about enabling EVFS to automatically start at system
startup.
Example
# evfsadm start
EVFS subsystem started.
Step 4: Starting the EVFS Subsystem 43