Installation manual

11 ATTO Technology Inc. ATTO Utilities Installation and Operation Manual
Connection Mode Options
Choices: AL, PTP, AL Preferred, PTP Preferred
Default: PTP Preferred
• Arbitrated Loop (AL): Connects to either an
Arbitrated Loop or a Fabric Loop Port (FL Port)
on a switch.
• Point-to-Point (PTP): Connects to a direct Fabric
connection, such as an F port on a switch.
• AL Preferred: Allows the card to determine what
kind of connection to use, but tries to connect in
Loop mode first, then Point-to-Point mode.
• PTP Preferred: Allows the card to determine
what kind of connection is to use, but tries to
connect in Point-to-Point mode first, then Loop
mode.
Data Rate
Choices for 4 Gig: 1 Gb/sec., 2 Gb/sec., 4Gb/sec., Auto
Choices for 8 Gig: 2 Gb/sec., 4Gb/sec., 8Gb/sec., Auto
Default: Auto
Selects the Fibre Channel transmission rate. Auto
indicates that the storage controller determines the rate
based upon the devices connected.
Interrupt Coalesce
Choices: None, Low, Medium, High
Default: (pre 3.20) Low, (3.20 and higher) None
Specifies the time period an 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.
Port Down Retry Count
Choices: 0-255
Default: 8
The number of times the driver retries a command to a
port which is currently logged out.
Note
Not all driver versions support this on 4 Gig
Celerity. This feature requires 2.63 or later
on Windows and Linux, and 3.25 or later on
OS X. All versions of the 8 Gig driver support
this.
Link Down Timeout
Choices: 0-255
Default: 0
The number of seconds the driver waits for a link that is
down to come up before reporting it to the operating
system.
Note
Not all driver versions support this on 4 Gig
Celerity. This feature requires 2.63 or later
on Windows and Linux, and 3.25 or later on
OS X. All versions of the 8 Gig driver support
this.
Spinup Delay
Choices: 0-255
Default: 0
Specifies number of seconds the driver waits for the first
device to be logged in and become ready.
Note
This is only honored by the Celerity BIOS
driver in 3.20 and later.
PCI Memory Write/Invalidate Button (PCI-X
models only)
Choices: Default, disabled
Default: Default
The hosts BIOS setting is overwritten and the PCI
memory write/invalidate setting is disabled.
PCI Latency Timer (PCI-X models only)
Choices: 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
192, 224, 248
Default: see below
Specifies how long the storage controller maintains
control of the PCI bus. Larger values allow the storage
controller to remain on the bus longer, improving
performance, especially for large files. However,
controlling the PCI bus for too long can starve IO to other
devices, adversley affecting their performance.As a
default, the computer system firmware/BIOS
automatically sets this vaule. However, adjusting the
value for the ATTO storage controller overrides the
system default, allowing you to achieve specific
performance results.