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5
Managing the device
Monitoring I2C failures on management modules
The management module accesses temperature sensors, fan controllers, power supplies, serial
PROMs, and other devices are all accessed through the I2C serial bus. When I2C devices are
inaccessible, generic (and uninformative) error messages are displayed on the management
module console interface. If you do not keep a record of the console messages before the
management module resets or reloads, these error messages will be lost.
At the first occurrence of an I2C failure, the Global I2C Error Indicator (GIEI) flag severity is set to
major. The GIEI flag is cleared only when the management module is able to access the same
physical device successfully. The GIEI severity flag is set to minor only if other I2C devices are
accessible. A set of static and dynamic Syslog messages are generated when any or all of the
following events occur:
•
•
•
These Syslog messages are generated in both the static and dynamic sections of the show logging
command output. A Syslog message is also sent to the SNMP log server.
When the GIEI is set to major, the first Syslog message displayed is an Alert. The following example
shows an Alert Syslog message where the GIEI is set to major:
PowerConnect# show logging
Sysloglogging: enabled (0 messages dropped, 0 flushes, 1 overruns)
Buffer logging: level ACDMEINW, 50 messages logged
level code: A=alert C=critical D=debugging M=emergency E=error
I=informational N=notification W=warning
Static Log Buffer:
Apr 16 18:21:25:A:System: Power Supply 2 , middle, Not Installed (FAILED)
Apr 16 18:21:25:A:System: Power Supply 3 , top, Not Installed (FAILED)
Apr 16 18:21:25:A:System: bad i2c access (GIEI = set), Severity Major, Mux
index 0, Muxtap 4, ID 0x4, Addr0x5, (FANTRAY4)
Apr 16 18:21:25:I:System: last good i2c access, Muxindex 0, Muxtap 1, ID
0x9, Addr0x1, (SNM1TEMP)
Dynamic Log Buffer (50 lines):
Apr 16 18:21:25:A:System: bad i2c access (GIEI = set), Severity Major, Mux
index 0, Mux tap 4, ID 0x4, Addr 0x5, (FANTRAY4)
Apr 16 18:21:25:I:System: last good i2c access, Mux index 0, Mux tap 1, ID
0x9, Addr 0x1, (SNM1TEMP)
Mar 28 12:36:47:A:System: Set fan speed to MED (75%)
Mar 25 21:40:47:A:System: Set fan speed to MED-HI (90%)
The Syslog message shows the last successful I2C access by the management module and also
contains the following information about the failed device:
•
•
•
100
When an I2C failure is first detected
When the GIEI severity is changed from major to minor
When the GIEI flag is cleared
Current state of the GIEI flag
Severity of the failure: major or minor
MUX index number:
-
The MUX index is always zero in 4-, 8-, and 16-slot MLX devices
PowerConnect B-MLXe Hardware Installation Guide
53-1002111-01
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