ATTO Technology ExpressSAS H1208 HBA Installation And Operation Manual page 16

Driver Settings
Please reference the README for information on driver
settings.
Changing Driver Settings in macOS
1. Open a Terminal window.
2. At the prompt, enter the command 'sudo nvram atto-
args-esashba2="[options]"' for H6xx products where
[options] are listed above. If you are not the root user,
you will be prompted for an administrator password.
3. Reboot the system for the changes to take effect.
These options are stored in system NVRAM; therefore
they persist across reboots.
Resetting the system NVRAM by pressing and holding
Command+Option+P+R during boot will remove the options. You can
view the current options in macOS by opening a Terminal window and
entering 'nvram atto-args-esasraid2'('nvram atto-args-esashba2' for
H6xx). You can remove the options in macOS by opening a Terminal
window and entering 'sudo nvram -d atto-args-esasraid2' ('sudo
nvram -d atto-args-esashba2' for H6xx).
Driver Events
The reporting of driver events is controlled by the event mask
driver setting. See the Driver Settings section for information
on how to set this mask. The hexadecimal mask value is the
sum of the event type values for the events you would like to
see.
The ATTO driver uses the system log to communicate driver
events to the user. Each event begins with a driver and
channel identifier, ATTOExpressSASRAID2 X.Y.Z
(ATTOExpressSASHBA2 X.Y.Z for H6xx products), where X is
the PCI bus number, Y is the PCI device number and Z is the
PCI function number. In general, only errors that are output
for event type 'Fatal' are significant; all others are mostly for
informational or diagnostic purposes. When turning on event
logging, be aware that certain events reported as errors are
expected. For example, a SCSI Check Condition error will be
reported for the first command sent to a device after power
on or a reset condition. Also, certain data underrun errors are
expected by the software and are normal.