McDATA 3000 manual Minimum Requirements for CRC, Fibre Channel MTU Batching

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Minimum Requirements for CRC

An Edge configured for FC/SCSI Tape Pipelining has added functionality when an End-to-End CRC error is detected. If an End-to-End CRC error occurs while Write Pipelining is active, the tape device will be repositioned to the last successful write and the Write I/Os active in the pipe at the time of the CRC error will be retried one time only. If the CRC retry is not successful bad ending status is returned.

Minimum Requirements for CRC

The minimum hardware levels for both Frame Level and End to End CRC are provided in the UltraNet Edge Storage Router - 3000 Series Release Notes (part number 30200581).

Fibre Channel MTU Batching

MTU Batching is available on the UltraNet Edge 3000 FCBB Fibre

Channel card.

The MTU Batching size defines the MTU for the batch of backbone frames that are collected and transmitted as one packet across the network. The batching size is set to 16000, this means a maximum of 16 frames will be batched.

MTU Batching is available for E_port and F_port configurations on the FCBB Fibre Channel card.

The default is On and set for 16000. To disable this option, see the Configuring the Internal McDATA Fibre Channel Switch Interface section in Appendix D, Advanced UCM Configurations.

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