Installation manual

12
1.2 FastFrame NVRAM Settings
The settings in the NVRAM tab vary depending upon the selected adapter and the operating system. Settings
unsupported by that OS are not displayed.
ATTO storage controllers are designed to operate
properly using factory settings. Entering invalid or
incorrect settings when using an NVRAM
configuration utility such as the ATTO ConfigTool may
cause your storage controller to function incorrectly.
CAUTIONCAUTION
Back up system data when installing or
changing hardware configurations.
Use caution when making changes to NVRAM
settings and only make changes to those with which
you are familiar. Once you have made the desired
changes, click
Commit to save the changes.
Changes do not take effect until you reboot the
system.
If you do not want to make any changes, you may
choose one of the following:
• Defaults: restores the storage controller to
factory default settings. The Commit button
must be clicked to save any changes.
• Restore: reverts to the NVRAM settings saved
the last time the Commit button was used.
Clicking Commit is not necessary.
Boot Driver (currently not available, future
support)
Choices: enabled, scan only, disabled
Default: disabled
If enabled and disk drives or a bootable CD are detected
during the bus scan, the BIOS driver remains resident. If
disabled, the BIOS starts, resets the storage controller
chip and unloads the driver.
If
Scan Only is selected, the BIOS driver scans the bus
and displays the devices attached, then unloads itself
after a brief delay.
FCoE LLI
Choices: enabled, disabled
Default: enabled
Specifies whether to enable Low Latency Interrupts (LLI)
for FCoE traffic. This prioritizes the processing of FCoE
frames but may result in excessive interrupts.
FIP VLAN Discovery
Choices: enabled, disabled
Default: enabled
Specifies whether the storage controller should attempt to
use the FCoE Initialization Protocol (FIP) to discover
configured VLANs.
Frame Size
Choices: 512, 1024, 2048
Default: 2048
Changes the size of the FC packet of information being
sent. Typically, the initiator and target negotiates the
desired frame size, starting with the largest value. The
frame size should be set to the largest value for normal
operation.
Device Discovery
Choices: Node WWN, Port WWN
Default: Port WWN
Specifies the type of device discovery the storage
controller performs. Use the
Port WWN when the
storage controller requires separate paths to a device and
the device is dual ported. A dual ported device has one
path when the
Node WWN is specified and two paths
when the
Port WWN is specified.
Interrupt Coalesce
Choices: None, Low, Medium, High
Default: Low
Specifies the time period a storage controller chip delays
an interrupt. This allows the storage controller chip to
queue up more than one interrupt before interrupting the
CPU. When this methodology is chosen there is less
overhead to service the interrupts. However, the
coalescing time may delay the delivery of the completion
for a single interrupt.
LLI Moderation
Choices: Disabled, Low, Medium, High
Default: Low
Specifies the time period an storage controller chip
delays a Low Latency Interrupt (LLI) for FCoE traffic. This
is the equivalent of the Interrupt Moderation setting for
low-latency FCoE frames.