FCの輻輳によりファイバチャネルでリンク切断が検出されました

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環境

AFF-A300
Brocade DCX8510

問題

EMSが FCターゲットでLink breakおよびLink upを報告する。

scsitarget.slifct.linkBreak: Link break detected on Fibre Channel target HBA 2c with event status 1 , topology type 1, status1 0x0, status2 0x0. scsitarget.slifct.linkBreak: Link break detected on Fibre Channel target HBA 2c with event status 1 , topology type 1, status1 0x0, status2 0x0. scsitarget.slifct.wqeError: FC port 2c has a WQE processing failure of type SLI_IO_TARGET_READ, command N/A, subtype x0, with status of 3 and an extended status x1a for NPIV port 259. scsitarget.slifct.wqeError: FC port 2c has a WQE processing failure of type SLI_IO_ABORT, command N/A, subtype x0, with status of 3 and an extended status x5 for NPIV port 259. scsitarget.slifct.wqeError: FC port 2c has a WQE processing failure of type SLI_IO_TARGET_READ, command N/A, subtype x0, with status of 3 and an extended status x4 for NPIV port 259. fcp.io.status: STIO Adapter:2c IO WQE failure, Handle 0x3, S_ID: 3C0200, OX_ID: 4AD, Status 0x3 Ext_Status 0x4 scsitarget.slifct.wqeError: FC port 2c has a WQE processing failure of type SLI_IO_TARGET_WRITE, command N/A, subtype x0, with status of 3 and an extended status x4 for NPIV port 259. scsitarget.slifct.linkBreak: Link break detected on Fibre Channel target HBA 2c with event status 1 , topology type 1, status1 0x0, status2 0x0. scsitarget.hwpfct.linkUp: Link up on Fibre Channel target adapter 2c.

スイッチのSFPには明らかなエラー統計がありません。
portstatsshow reports tim_txcrd_z / stat_ftx * 100%が 20%を超えています。

portstatsshow 72 stat_wtx 12220194918351 4-byte words transmitted stat_wrx 506668000517569 4-byte words received stat_ftx 2450829854 Frames transmitted stat_frx 425069228 Frames received stat_c2_frx 0 Class 2 frames received stat_c3_frx 425244937 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 512886519 Time TX Credit Zero (2.5Us ticks)