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New Contributor
Posts: 2
Registered: ‎08-24-2011

Lots of Low level Interrupts. How to solve and what exactly it means

Folks,

The port has an HBA (from a newly built server ) connected to it. The hands and feet support have verified Cables , sfp , etc and all seem to be fine but the port still doesn't come up.

I tried portstatsclear , and disable/enable but it doesn't help , however I noticed LLi count increasing after portstatsclear. Any idea on how to resolve this and which component might be having the issue?

portshow 2/32
portIndex: 272
portName:
portHealth: OFFLINE

Authentication: None
portDisableReason: None
portCFlags: 0x1
portFlags: 0x41  PRESENT
LocalSwcFlags: 0x0
portType:  17.0
portState: 2    Offline 
Protocol: FC
portPhys:  5    No_Sync         portScn:   2    Offline  
port generation number:    0
state transition count:    1        

portId:    6c9880
portIfId:    43220808
shareIfId:   43220818
portWwn:   XXXXXXXXXXXXXXXXX

portWwn of device(s) connected:

Distance:  normal
portSpeed: 8Gbps

LE domain: 0
FC Fastwrite: OFF
Interrupts:        0          Link_failure: 0          Frjt:         0         
Unknown:           0          Loss_of_sync: 1          Fbsy:         0         
Lli:               6700       Loss_of_sig:  2         
Proc_rqrd:         0          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:        0         
Suspended:         0          Lr_out:       0         
Parity_err:        0          Ols_in:       0         
2_parity_err:      0          Ols_out:      0         
CMI_bus_err:       0        

portcfgshow 2/32
Area Number:              152
Speed Level:              8G
Fill Word:                0(Idle-Idle)
AL_PA Offset 13:          OFF
Trunk Port                ON
Long Distance             OFF
VC Link Init              OFF
Locked L_Port             OFF
Locked G_Port             ON
Disabled E_Port           ON
Locked E_Port             OFF
ISL R_RDY Mode            OFF
RSCN Suppressed           OFF
Persistent Disable        OFF
LOS TOV enable            OFF
NPIV capability           ON
QOS E_Port                AE
Port Auto Disable:        OFF
Rate Limit                OFF
EX Port                   OFF
Mirror Port               OFF
Credit Recovery           ON
F_Port Buffers            OFF
Fault Delay:              0(R_A_TOV)
NPIV PP Limit:            126
CSCTL mode:               OFF

porterrshow | grep "272:"
272
:    0      0      0      0      0      0      0      0      0      0      0      1      2      0      0

I saw a few Loss of Sync and Loss of Signal error before I cleared the stats

Valued Contributor
Posts: 931
Registered: ‎12-30-2009

Re: Lots of Low level Interrupts. How to solve and what exactly it means

Is the HBA capable to run 8G and/or does the cable plant support that capability?

My reason for asking, the port is fixed at 8G.

Did you try lower rates like 4 or 2?

New Contributor
Posts: 2
Registered: ‎08-24-2011

Re: Lots of Low level Interrupts. How to solve and what exactly it means

Thanks Dion

I changed the speed to 4G and the HBA logged in. I do not have host access and can't tell if HBA supports 8G. But it seems that was the issue.

Shouldn't the status of port be "In-Sync" or something instead of Offline? Although I am no expert but Speed negotiation issues shouldn't make the port offline. Please share your views if you can. 

portcfgspeed 2/32 4
belh109f01:e559609> portshow 2/32
portIndex: 272
portName:
portHealth: HEALTHY

Authentication: None
portDisableReason: None
portCFlags: 0x1
portFlags: 0x20b03       PRESENT ACTIVE F_PORT G_PORT LOGICAL_ONLINE LOGIN NOELP ACCEPT FLOGI
LocalSwcFlags: 0x0
portType:  17.0
portState: 1    Online  
Protocol: FC
portPhys:  6    In_Sync         portScn:   32   F_Port   
port generation number:    0
state transition count:    2        

portId:    6d9880
portIfId:    43220808
shareIfId:   43220818
portWwn:   XXXXXXXXXXXXXXX

portWwn of device(s) connected:
        10:00:00:00:xx:xx:xx:xx
Distance:  normal
portSpeed: 4Gbps

Regular Contributor
Posts: 226
Registered: ‎01-08-2011

Re: Lots of Low level Interrupts. How to solve and what exactly it means

Which portcfgfillword modes did you try on the port when it was in 8G?

Valued Contributor
Posts: 931
Registered: ‎12-30-2009

Re: Lots of Low level Interrupts. How to solve and what exactly it means

To findout if the HBA supports 8G put the port in AN mode.

Shouldn't the status of port be "In-Sync" or something instead of  Offline? Although I am no expert but Speed negotiation issues shouldn't  make the port offline. Please share your views if you can.

In-Sync is impossible with a speed mismatch.

Possibly the status could be No-Sync, but it depends where the proces halts I guess.

And looking back it did

portState: 2    Offline 
Protocol: FC
portPhys:  5    No_Sync         portScn:   2    Offline

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