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Contributor
Posts: 33
Registered: ‎04-24-2010

Link error on AIX system

Hi Sir,

Customer got Link error on AIX system.

I checked switch log, there are NOT error on port error statistic,

porterrshow        :

          frames      enc crc    crc    too too    bad    enc disc   link   loss loss   frjt   fbsy

       tx     rx in    err    g_eof shrt   long   eof out   c3    fail sync   sig

     =========================================================================================================

130:   16.2m  86.0m 0      0      0 0      0      0 0      0      0 0      0      0 0

  270:   80.5m 13.0m   0      0 0      0 0      0      0 0      0      0 0      0     

After clear port statistic(command: portstatsclear),just have some numbers of tim_txcrd_z and tim_txcrd_z_vc  on portstatsshow as belowing information:

portstatsshow 130

stat_wtx 542810975   4-byte words transmitted

stat_wrx 980805117   4-byte words received

stat_ftx 16377743    Frames transmitted

stat_frx 86208606    Frames received

stat_c2_frx 0           Class 2 frames received

stat_c3_frx 86208606    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 336 Time TX Credit Zero (2.5Us ticks)

tim_txcrd_z_vc  0- 3:  0 0           0           0        

tim_txcrd_z_vc  4- 7: 336         0           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 0           Invalid ordered set

er_rx_c3_timeout 0           Class 3 receive frames discarded due to timeout

er_tx_c3_timeout 0           Class 3 transmit frames discarded due to timeout

er_c3_dest_unreach 0           Class 3 frames discarded due to destination unreachable

er_other_discard 0           Other discards

er_type1_miss 0           frames with FTB type 1 miss

er_type2_miss 0           frames with FTB type 2 miss

er_type6_miss 0           frames with FTB type 6 miss

er_zone_miss 0           frames with hard zoning miss

er_lun_zone_miss 0           frames with LUN zoning miss

er_crc_good_eof 0           Crc error with good eof

er_inv_arb 0           Invalid ARB

open 0           loop_open

transfer 0           loop_transfer

opened                      0           FL_Port opened

starve_stop 0           tenancies stopped due to starvation

fl_tenancy 0           number of times FL has the tenancy

nl_tenancy 0           number of times NL has the tenancy

  zero_tenancy 0           zero tenancy


what's means "tim_txcrd_z 336" and "tim_txcrd_z_vc"?

how to resolve the issue?


Thanks in advance!

Best Regards

Richard

Valued Contributor
Posts: 761
Registered: ‎06-11-2010

Re: Link error on AIX system

Hi,

Those counters report the number of 2.5 us periods that there were no BB credits to send a frame. But at first sight, I would not consider that value an issue.

What are the errors reported by the server? Are they reported by all the HBAs or just in one?

Do the storage ports report any error?

Do the F-ports where the storage is connected report any error?

Are there ISLs in the middle? Do they report any event?

Rgds

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