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Cisco Bug: CSCut35123 - elap-mr2(2.2.3e)->elcap-mr3 2.2.(3.193) PSU locks up I2C

Last Modified

Aug 04, 2017

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.2(8b)A

Description (partial)

Fix and test is very complicated, and it requires special code to reproduce reliably.

Symptom:
After high availability failover, you may see the following message:

dmesg of one IOM shows
 
OBFL:<3>run_gilroy_thread:2453:119756829:Unable to release gilroy ret=-11
 bus1 not idle, gpio=x40900000 sr=x20
 OBFL: at24 1-004b: read 128 bytes offset 0 to 4b, err -16
 OBFL: at24 1-004f: read 128 bytes offset 0 to 4f, err -16
 OBFL: at24 1-0056: read 128 bytes offset 0 to 56, err -16
 OBFL: at24 1-005d: read 128 bytes offset 0 to 5d, err -16

< showi2c may show
< 
< p.psu0.fru={SUCCESS=1}
< p.psu0.psmi={EBUSY=160593}
< p.psu1.fru={SUCCESS=1}
< p.psu1.psmi={SUCCESS=8681,EBUSY=155637}
< p.psu2.fru={SUCCESS=1}
< p.psu2.psmi={SUCCESS=8671,EBUSY=155633}
< p.psu3.fru={SUCCESS=1}
< p.psu3.psmi={SUCCESS=8671,EBUSY=155621}


If you run the following command PSU's will show equipped but no other information.

`show chassis inventory expand`
Chassis 1
    PSU 1:
        Presence: Equipped
        Product Name:
        PID:
        VID: V03
        Vendor:
        Serial (SN):
        HW Revision: 0

    PSU 2:
        Presence: Equipped
        Product Name:
        PID:
        VID: V03
        Vendor:
        Serial (SN):
        HW Revision: 0

    PSU 3:
        Presence: Equipped
        Product Name:
        PID:
        VID: V03
        Vendor:
        Serial (SN):
        HW Revision: 0

    PSU 4:
        Presence: Equipped
        Product Name:
        PID:
        VID: V03
        Vendor:
        Serial (SN):
        HW Revision: 0

Output if reading properly would look like the following.

PSU 1:
        Presence: Equipped
        Product Name: Platinum AC PSU for N20-C6508 Blade Server Chassis
        PID: UCSB-PSU-2500ACPL
        VID: V02
        Vendor: Cisco Systems Inc
        Serial (SN): DTM170302UP
        HW Revision: 0

    PSU 2:
        Presence: Equipped
        Product Name: Platinum AC PSU for N20-C6508 Blade Server Chassis
        PID: UCSB-PSU-2500ACPL
        VID: V02
        Vendor: Cisco Systems Inc
        Serial (SN): DTM17030310
        HW Revision: 0

    PSU 3:
        Presence: Equipped
        Product Name: Platinum AC PSU for N20-C6508 Blade Server Chassis
        PID: UCSB-PSU-2500ACPL
        VID: V02
        Vendor: Cisco Systems Inc
        Serial (SN): DTM1703040F
        HW Revision: 0

    PSU 4:
        Presence: Equipped
        Product Name: Platinum AC PSU for N20-C6508 Blade Server Chassis
        PID: UCSB-PSU-2500ACPL
        VID: V02
        Vendor: Cisco Systems Inc
        Serial (SN): DTM170303SU
        HW Revision: 0


Conditions:
Golden Delta PSUs
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