Brocade Communications Systems BR-1020 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 47)

Brsocade Adapters Troubleshooting Guide 29

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FCoE and Fibre Channel problems

Disk I/O requests causes low throughput and high latency on Linux

If a high number of I/O requests is causing low throughput and high latency on Linux systems, refer

to the following descriptions of possible causes and recommended actions to help resolve the

problem.

Possible Cause: The maximum input/output operations per second are too low on Linux hosts.

Action: Refer to “Linux tuning” on page 77 for suggestions to optimize adapter performance in

Linux systems.

Disk I/O requests causes low throughput and high latency on VMware

If a high number of I/O requests is causing low throughput and high latency on VMware systems,

refer to the following descriptions of possible causes and recommended actions to help resolve the

problem.

Possible Cause: The maximum input/output operations per second are too low on VMware hosts.

Action: Refer to “VMware tuning” on page 79 for suggestions to optimize adapter performance in

VMware systems.

Adapter is not showing in the fabric

If the adapter does not appear as a Fibre Channel device in the fabric, refer to the following

descriptions of possible causes and recommended actions to help resolve the problem.

Possible Cause: There is a problem in the fabric or a protocol issue between the adapter and a

fabric.

Action: Check the fabric statistics. Refer to “Fabric statistics” on page 56 for methods to display

fabric statistics for the adapter.

• If counts for FLOGI sent and FLOLGI accept fabric statistics do not match, suspect fabric

problem or protocol issue between adapter and fabric.

• If fabric offline counts increase and fabric maintenance is not occurring, this may indicate a

serious fabric problem. Refer to your switch troubleshooting guide to isolate and resolve the

problem.

Virtual devices not listed in name server

If virtual devices are not listed in the fabric’s name server, refer to the following descriptions of

possible causes and recommended actions to help resolve the problem.

Possible Causes:

• Problem in the fabric or a protocol issue between the adapter and fabric.

• NPIV is not supported or is disabled on the switch.

Action: Check virtual port statistics, such as FDISK sent, FDISK accept, and No NPIV support

statistics. Refer to “Virtual port statistics (HBA only)” on page 61 for methods to display virtual port

statistics.

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Brocade Communications Systems BR-1020 Anleitung zur Fehlerbehebung Seite 47