ATTO Technology 1550D Benutzerhandbuch

14

Note

Default values, even if you have not used the 
ExpressWizard, are appropriate for most 
configurations, but may be modified.

1

Follow the 

.

2

On the iSCSI page, enable SpeedWrite.

3

On the Ethernet page, change MTU to 9014.

Note

4

For Windows operating systems, use the ATTO 

iSCSI performance configuration tool 
(Windows only)
The ATTO iSCSI performance configuration tool 
changes the Windows registry parameters for 
Microsoft iSCSI Initiator and TCP/IP to enhance 
overall data throughput.

1

From the CD which came with your iPBridge, 
copy the Perftune.exe file to your hard drive.

2

Execute the program. 

3

Click on Use ATTO Performance Settings. 
Settings take effect on the next system reboot.

The following settings are affected:

FirstBurstLength
The maximum amount, in bytes, of unsolicited data an 
iSCSI initiator may send to the target during the 
execution of a single SCSI command including the 
immediate data and the sequence of unsolicited Data-Out 
PDUs which follow the command. FirstBurstLength 
cannot exceed 

ATTO value: 1048576 decimal 00100000 hex

MaxBurstLength
The maximum SCSI data payload, in bytes, in a Data-In 
or a solicited Data-Out iSCSI sequence. A sequence 
consists of one or more consecutive Data-In or Data-Out 
PDUs that end with a Data-In or Data-Out PDU with the 
F bit set to one. 

ATTO value: 1048576 decimal 00100000 hex 

MaxRecvDataSegmentLength
The maximum data segment length, in bytes, that a 
transmitter (initiator or target) can receive in an iSCSI 
PDU. The transmitter is required to send PDUs with a 
data segment that does not exceed 
MaxRecvDataSegmentLength of the receiver.

ATTO value: 1048576 decimal 00100000 hex

MaxTransferLength
The maximum number of bytes that may be transferred by 
a single SCSI request block (SRB).

ATTO value 1048576 decimal 00100000 hex

SrbTimeoutDelta
The maximum amount of time, in seconds, before an SRB 
request will time out.

ATTO value 300 decimal 0000012c hex

Tcp1323Opts
This parameter controls RFC 1323 time stamps and 
window-scaling options. Time stamps and window 
scaling are enabled by default, but can be manipulated 
with flag bits. Bit 0 controls window scaling and bit 1 
controls time stamps.

ATTO value: 1