The Marriage of Two Mainframes via Optical link ... Something old Something new Something borrowed? Something BIG BLUE
Chris Hoelscher Lead Sys DBA IBM Global Technical Services on assignmemt to Humana Inc. T 502.476.2538 or 502.407.7266 -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Radoslaw Skorupka Sent: Tuesday, April 6, 2021 6:07 PM To: [email protected] Subject: Re: [IBM-MAIN] Debugging "A high error rate was detected on the Optical Link network." HMC alert [External Email: Use caution with links and attachments] We've got it! "when it was connected to another mainframe, but it has it now" So something has changed. This is the most likely moment for error. Now it's time for investigation - what cable is new, what is old, what plug was inserted, etc. -- Radoslaw Skorupka (looking for new job) Lodz, Poland W dniu 06.04.2021 o 22:20, Christian Svensson pisze: > Hello, > > I understand that ideally I would find the error - but all the values > seem correct in my eyes. > The optical values are fine, no errors shown on the interfaces, etc. > > This bugs me a bit. I did not have this issue when it was connected to > another mainframe, but it has it now... > > Regards, > > On Tue, Apr 6, 2021 at 3:32 PM Radoslaw Skorupka > <[email protected]> > wrote: > >> You can disable that using HMC features (it is called Optical Network >> Errors or similar). >> However DON'T DO IT. >> This is symptom of some problem. It can be pinched FO cable, dirty >> connector or failing SFP module. >> Unfortunately it is almost good, so there is no simple way to know >> whether cable change helped or not. >> We like more consistent failures ;-) >> However I would start from visual inspection and then cable change. >> >> -- >> Radoslaw Skorupka >> (looking for new job) >> Lodz, Poland >> >> >> >> W dniu 05.04.2021 o 12:25, Christian Svensson pisze: >>> Good day, >>> >>> Recently I have been getting these kinds of alerts from my HMC. It >>> all started when I connected an old DS6800 and the details are: >>> >>> Node 1 >>> Machine: 2498-B40 >>> Serial: IBMCA107312B >>> Physical Interface: 6620 >>> Logical Interface: 0020 >>> >>> Node 2 >>> Machine: 1750-511 >>> Serial: IBM130000715 >>> Physical Interface: 0100 >>> Logical Interface: 0000 >>> >>> I keep getting these errors about 3-4 per day with the exact same >>> interfaces specified. No others, just these. >>> >>> When I look at the referenced SAN switch and I do a "porterrshow" >>> things seem fine: >>> frames enc crc crc too too bad enc >> disc >>> link loss loss frjt fbsy c3timeout pcs >>> tx rx in err g_eof shrt long eof out c3 >>> fail sync sig tx rx err >>> 20: 4.8m 46.9k 0 0 0 0 0 0 0 0 >>> 0 2 2 0 0 0 0 0 >>> 32: 27.5k 17.7k 0 0 0 0 0 0 0 0 >>> 0 0 0 0 0 0 0 0 >>> 33: 19.3k 13.6k 0 0 0 0 0 0 0 0 >>> 0 0 1 0 0 0 0 0 >>> 36: 78 79 0 0 0 0 0 0 0 0 >>> 0 0 1 1 0 0 0 0 >>> 37: 56 57 0 0 0 0 0 0 0 0 >>> 0 0 0 1 0 0 0 0 >>> >>> I assume the interface given in the alert is in hex, so the error >>> would >> be >>> about port 32 (which is indeed connected to the DS6800 controller 1, >>> port 0). >>> As you can see the port seems to be fine. >>> >>> The full portshow 32 is here: >>> portIndex: 32 >>> portName: port32 >>> portHealth: HEALTHY >>> >>> Authentication: None >>> portDisableReason: None >>> portCFlags: 0x1 >>> portFlags: 0x1020b03 PRESENT ACTIVE F_PORT G_PORT U_PORT >> LOGICAL_ONLINE >>> LOGIN NOELP ACCEPT FLOGI >>> LocalSwcFlags: 0x0 >>> portType: 17.0 >>> POD Port: Port is licensed >>> portState: 1 Online >>> Protocol: FC >>> portPhys: 6 In_Sync portScn: 32 F_Port >>> port generation number: 16 >>> state transition count: 3 >>> >>> portId: 662000 >>> portIfId: 43020017 >>> portWwn: 20:20:00:05:1e:e8:74:30 >>> portWwn of device(s) connected: >>> 50:05:07:63:0e:80:02:11 >>> Distance: normal >>> portSpeed: N2Gbps >>> >>> Credit Recovery: Inactive >>> Aoq: Inactive >>> FAA: Inactive >>> F_Trunk: Inactive >>> LE domain: 0 >>> Peer beacon: Off >>> FC Fastwrite: OFF >>> Interrupts: 0 Link_failure: 0 Frjt: 0 >>> Unknown: 0 Loss_of_sync: 0 Fbsy: 0 >>> Lli: 15 Loss_of_sig: 0 >>> Proc_rqrd: 63 Protocol_err: 0 >>> Timed_out: 0 Invalid_word: 0 >>> Rx_flushed: 0 Invalid_crc: 0 >>> Tx_unavail: 0 Delim_err: 0 >>> Free_buffer: 0 Address_err: 0 >>> Overrun: 0 Lr_in: 3 >>> Suspended: 0 Lr_out: 0 >>> Parity_err: 0 Ols_in: 0 >>> 2_parity_err: 0 Ols_out: 3 >>> CMI_bus_err: 0 >>> >>> As far as I can tell the port is doing just fine, and I have not >>> received any reports of connectivity issues to the actual DASDs. >>> Any suggestions on what is going on, or worst case - how I can >>> disable these alerts? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN The information transmitted is intended only for the person or entity to which it is addressed and may contain CONFIDENTIAL material. If you receive this material/information in error, please contact the sender and delete or destroy the material/information. Humana Inc. and its subsidiaries comply with applicable Federal civil rights laws and do not discriminate on the basis of race, color, national origin, ancestry, age, disability, sex, marital status, gender, sexual orientation, gender identity, or religion. Humana Inc. and its subsidiaries do not exclude people or treat them differently because of race, color, national origin, ancestry, age, disability, sex, marital status, gender, sexual orientation, gender identity, or religion. English: ATTENTION: If you do not speak English, language assistance services, free of charge, are available to you. Call 1‐877‐320‐1235 (TTY: 711). Español (Spanish): ATENCIÓN: Si habla español, tiene a su disposición servicios gratuitos de asistencia lingüística. Llame al 1‐877‐320‐1235 (TTY: 711). 繁體中文(Chinese):注意:如果您使用繁體中文,您可以免費獲得語言援助 服務。請致電 1‐877‐320‐1235 (TTY: 711)。 Kreyòl Ayisyen (Haitian Creole): ATANSION: Si w pale Kreyòl Ayisyen, gen sèvis èd pou lang ki disponib gratis pou ou. Rele 1‐877‐320‐1235 (TTY: 711). Polski (Polish): UWAGA: Jeżeli mówisz po polsku, możesz skorzystać z bezpłatnej pomocy językowej. Zadzwoń pod numer 1‐877‐320‐1235 (TTY: 711). 한국어 (Korean): 주의: 한국어를 사용하시는 경우, 언어 지원 서비스를 무료로 이용하실 수 있습니다. 1‐877‐320‐1235 (TTY: 711)번으로 전화해 주십시오. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
