McDATA Eclipse 2640 SAN Informations techniques télécharger pdf (Page 91)

Configuring iSAN Connections

4-13

Configuring TCP Ports for iFCP

Router without a XFER_RDY from the target device.

Specify the maximum amount of buffered data, in

kilobytes, in the text field. The memory limit is a single

pool for all Fabric Channel login sessions.

• Selecting the Transmit Buffer Management option allows the user

to manage the amount of Fabric Channel receive buffers that

an iFCP port has for receiving the Fabric Channel frames

forwarding from Fabric.

In cases where ELSs are issued in the middle of large amount

of data packets and the iFCP/TCP side is connected to a slow

link (e.g. OC3 link), user may experience ELS timeout. ELS

timeout occurs when ELSs have command timeout values

shorter than normal Read / Write commands and when ELSs

are queued behind the large amount of Read/Write data.

Reducing the number of Fabric Channel receive buffers will

cause congestion back into any attached device or fabric to

occur sooner or for lower amounts of outstanding data, which

then minimizes the ELSs timeout condition.

NOTE: Transmit buffer option may cause head of line blocking and

congestion which might lower the performance of the system instead of

helping it.

• Select the Defaults button to reset all options in the iFCP area

to the following:

• Compression Level - Off

• Compression Method - LZO

• Selective ACKnowledgement - enabled

•FastWrite - disabled

• Transmit Buffer Management - disabled

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McDATA Eclipse 2640 SAN Informations techniques Page 91