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Sporadically intermittent path loss to LUN

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Category:
fabric-interconnect-and-management-switches
Specialty:
brocade
Last Updated:

Applies to

  • Brocade FC Switches
  • Fabric OS
  • ONTAP

Issue

  • All connected ESXi hosts report sporadically intermittent path loss to FC datastore for 1-2 seconds and then automatically reconnect
  • Repeating EMS log entries about adapter ports receiving reset requests:
Wed Jul 20 10:18:47 +0000 [NODENAME: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:0d AEN 0x8048 (RECV_ERROR) MboxStatus1 0xfffe MboxStatus2 0x1
  • The portstatsshow output indicates increased er_tx_c3_timeout and er_bad_os (Invalid ordered set)

portstatsshow 10
stat_wtx                3858765541  4-byte words transmitted
stat_wrx                980402941   4-byte words received
stat_ftx                296980277   Frames transmitted
stat_frx                217256125   Frames received
stat_c2_frx             0           Class 2 frames received
stat_c3_frx             217256125   Class 3 frames received
stat_lc_rx              0           Link control frames received
stat_mc_rx              0           Multicast frames received
stat_mc_to              0           Multicast timeouts
stat_mc_tx              0           Multicast frames transmitted
tim_rdy_pri             0           Time R_RDY high priority
tim_txcrd_z             4604055     Time TX Credit Zero (2.5Us ticks)
tim_txcrd_z_vc  0- 3:  0           0           0           0         
tim_txcrd_z_vc  4- 7:  0           4604055     0           0         
tim_txcrd_z_vc  8-11:  0           0           0           0         
tim_txcrd_z_vc 12-15:  0           0           0           0         
er_enc_in               0           Encoding errors inside of frames
er_crc                  0           Frames with CRC errors
er_trunc                0           Frames shorter than minimum
er_toolong              0           Frames longer than maximum
er_bad_eof              0           Frames with bad end-of-frame
er_enc_out              0           Encoding error outside of frames
er_bad_os               2974218510  Invalid ordered set
er_rx_c3_timeout        0           Class 3 receive frames discarded due to timeout
er_tx_c3_timeout        312         Class 3 transmit frames discarded due to timeout

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