The Extended Fabrics feature extends the distance the ISLs can reach over an extended fiber. As Fibre Channel speeds increase, the maximum distance decreases for each switch. can be used to increase the capacity of the links. Wavelength division multiplexing, such as dense wavelength division multiplexing (DWDM). ISLs can use long-distance dark fiber connections to transfer data. The Brocade documentation indicates that special consideration is needed for this type of long distance implementation.įabric OS Administrator's Guide, pages 551-153: But the media server and client are in sites approximately 81 kilometers apart and connected with fiber cables and devices using dense wavelength division multiplexing (DWDM). The portshow output from the Brocade switches indicates they are configured with “Distance” set to normal and “Portspeed” set to 8Gbps. However, the problem is actually related to the configuration of the switches and the distance between them. The error counters from the SAN switches suggest that a hardware problem is present. Interrupts: 0 Link_failure: 29363 Frjt: 0 Notice the additional error counters for link and signal failure. The Brocade SAN switch configuration ( port show ) displays the port statuses as Offline and In_Sync with a portSpeed of 8Gbps and distance set to normal. It appears that the frames arriving are not being properly recognized.Įr_enc_out 1084058 Encoding error outside of frames The Brocade SAN switch log shows high error counts for the connection to the media server. The nbftclnt debug log (OID 200) does not show any HBA related error messages. The nbftsrvr debug log (OID 199) does not show any HBA related error messages. Replacing the fiber cable, HBA, or appliance chassis does not fix the issue. Restarting the NetBackup SAN client service (nbftclnt) will bring the port back online until the next hang.
The adjacent SAN switch will show the port state is ”IN_SYNC”.
The yellow LED on the HBA is lit and the two other LEDs are not lit.
This causes backup and restore jobs using the fiber transport (FT) connection to stop. One or more of the SAN client ports on the appliance hangs and becomes unresponsive.
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